Tom ____ into the house when no one ____Aslipped:was looking Bhad slipped:looked Cwas slipping :looked(附加理由)

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Tom ____ into the house when no one ____Aslipped:was looking Bhad slipped:looked Cwas slipping :looked(附加理由)

Tom ____ into the house when no one ____Aslipped:was looking Bhad slipped:looked Cwas slipping :looked(附加理由)
Tom ____ into the house when no one ____
Aslipped:was looking Bhad slipped:looked Cwas slipping :looked(附加理由)

Tom ____ into the house when no one ____Aslipped:was looking Bhad slipped:looked Cwas slipping :looked(附加理由)
选择A.理由:slip into 溜进来,动作瞬间完成,不能用过去完成时或者过去进行时.而后一个动作no one was looking 表示溜进来的当时 正好没人看到,故用进行时.懂了吧~

A
首先整个个句子的时态是过去式,所以排除b
其次when后面引导时间状语从句,“look”是在“slip”的时候,是一种状态,也可以理解成因为是他“slip”的时候看的,是一个过去进行时