One of the men was lying on the ground after _______ down by a piece of rock.

Câu hỏi :

One of the men was lying on the ground after _______ down by a piece of rock.

A knocking 

B being knocked

C knocking him

D was knocked

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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