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13、 (2011年濰坊質(zhì)量監(jiān)測)When people cut down big trees，new trees should be planted.________they will have no trees to cut down in the future.

A．If not                           B．If so

C．If no so                        D．If don’t

12、 (2010年海南五校聯(lián)考)I have been living in Haikou for 10 years，but seldom________so lonely as now.

A．have I felt                                   B．I have felt

C．had I felt                                    D．I had felt

11、 (2010年湖北部分重點中學(xué)高三第一次聯(lián)考)Many a writer of newspaper articles ________ to writing novels.

A．has turned                           B．have turned

C．being turned                        D．a(chǎn)re going to turn

10、 (2011年西安八校聯(lián)考)—Mom，have you washed my clothes?

—No.I’m busy，but I________them for you now.

A．wash                           B．a(chǎn)m washing

C．will wash                     D．would wash

9、 (2010年青島市第二次模擬)—Where is your uncle’s home?

—In New York.But he________in Boston for four years.

A．has lived                       B．lived

C．had lived                      D．had been living

8、 (2010年濟(jì)南4月模擬)—Can you give some advice on what I said just now?

—Sorry.My mind________.

A．is wandering                 B．was wandering

C．has wandered               D．has wandered

7、 (2011年陜西寶雞檢測)Mary，I should tell you it is the third time that you________.

A．forgot to do                         B．forgot doing

C．have forgotten to do             D．had forgotten doing

6、 (2010年蘇州一模)—Are you going to further your studies after graduation?

—Well，I________yet.I might make some other choices.

A．didn’t decide                 B．haven’t decided

C．don’t decide                 D．hadn’t decided

5、 (2011年海淀區(qū)第二學(xué)期期中練習(xí))—Why didn’t you come to the cinema with us last Saturday?

—Oh，sorry.But I________the film.

A．see                                     B．saw

C．have seen                     D．had seen

4、 (2011年日照市調(diào)研考試)—Monitor?

—I’m not monitor of our class.I________with the teacher until the monitor is elected.

A．will just help                        B．a(chǎn)m just to help

C．a(chǎn)m just helping                     D．have just helped