That young boy was knocked ______ by a passing car.

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That young boy was knocked ______ by a passing car.

A. on

B. at

C. in

D. down

参考答案:

D19.答案为D。这个小男孩被经过的汽车撞倒了。knock down“撞倒”;knock on“敲击”; knock at“敲(门)”;knock in“(把钉子)钉入”。