【題目】Sam (hide) behind the door when his mother came in.

【答案】was hiding
【解析】句意：當(dāng)他媽媽進(jìn)來的時候，山姆正藏在門后。hide延續(xù)性動詞，表示動作正在進(jìn)行，用進(jìn)行時態(tài)，根據(jù)came可知用過去進(jìn)行時，故填was hiding。

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