【題目】-- What is he doing?
-- He _________ his homework.
A.doing
B.does
C.is doing
D.do

【答案】C
【解析】句意:他在做什么?他在做家庭作業(yè)。根據(jù)問(wèn)句可知,時(shí)態(tài)為現(xiàn)在進(jìn)行時(shí)態(tài)。進(jìn)行時(shí)的結(jié)構(gòu):be + V-ing ,故答案選C。

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