My father was reading a book ________ I was doing my homework.
A．beforeB．a(chǎn)fterC．whenD．while
D

試題分析：句意：我在做作業(yè)的時(shí)候，我爸爸在看書。A在...之前 B在...之后 C當(dāng)...時(shí)候 D當(dāng)...同時(shí)；題中爸爸看書和我做作業(yè)這兩個(gè)動(dòng)作同時(shí)進(jìn)行，因此用while。while作為當(dāng)...同時(shí)的意思的時(shí)候后面要接進(jìn)行時(shí)態(tài)。故選D.
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