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If there is no answer at the front door, at the back door.A.try to knockB.trying

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If there is no answer at the front door, at the back door.A.try to knockB.trying

If there is no answer at the front door, ________at the back door.

A.try to knock

B.trying to knock

C.try knocking

D.trying knocking

试题答案

C

标签：atanswerfrontthethere

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