—Shall we go out for a walk?
—Sorry, I can’t. I _______ my homework.
A．doB．didC．a(chǎn)m doingD．was doing
C
考查情景交際�！拔覀兂鋈ド⒉胶脝�？”“對(duì)不起，我不能。我正在寫(xiě)作業(yè)呢�！闭f(shuō)話時(shí)正在進(jìn)行的動(dòng)作，用現(xiàn)在進(jìn)行時(shí)。故選C。
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