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【題目】—What Mary and Lucy ?—They are playing the guitar.
A.do; do
B.are; do
C.are; doing
D.does; do

【答案】C
【解析】答句 They are playing the guitar.用了現(xiàn)在進(jìn)行時(shí)，可以推斷問句的意思是“瑪麗和露絲正在干什么？”，也需要用現(xiàn)在進(jìn)行時(shí)，故選C。

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