—Shall we play tennis now?

—Sorry, I can’t. I my homework.

A. do B. did C. have done D. am doing

D 【解析】句意：——我們現(xiàn)在打網(wǎng)球去好嗎？——對(duì)不起，我不能去，我在做作業(yè)。A. do 做，用于一般現(xiàn)在時(shí)態(tài)，主語(yǔ)復(fù)數(shù)時(shí)； B. did做 ，用于一般過(guò)去時(shí)態(tài)； C. have done 做，用于一般現(xiàn)在完成時(shí)態(tài)； D. am doing做，用于現(xiàn)在進(jìn)行時(shí)態(tài)，主語(yǔ)是I時(shí)；根據(jù) now可知用現(xiàn)在進(jìn)行時(shí)態(tài)，故選D
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