【題目】They were smoking ______ the teacher appeared in front of them.
A.where
B.while
C.what
D.when

【答案】D
【解析】句意:他們正在抽煙,這時(shí)老師出現(xiàn)在他們面前。when這時(shí),那時(shí),相當(dāng)于and then。while正當(dāng)……的時(shí)候,后跟進(jìn)行時(shí)態(tài)。where哪里,what什么,均不合題意。因?yàn)閍ppear是瞬間動(dòng)詞,不能表示動(dòng)作的延續(xù),故選D。

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