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19．He can't state clearly how long he has ___________ the bicycle？（　　）

A．

keep

B．

buy

C．

bought

D．

had

分析他說不清楚他買這輛自行車有多久了．

解答答案：D
how long 問的是多長時間，連用動詞要用延續(xù)性狀態(tài)或者延續(xù)性動作，buy對應的延續(xù)性狀態(tài)是have，根據(jù)題干可知該句是現(xiàn)在完成時，其構(gòu)成是have/has+過去分詞．have的過去分詞是had．故選D．

點評本題主要考查動詞時態(tài)，做此類題目要注意時間狀語、標志詞．根據(jù)上下文所表達的含義，做出判斷．同時更應記清時態(tài)的構(gòu)成形式．

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