【題目】Please ________ your ashes before it fails on the carpet.

A. cut offB. knock off

C. get offD. drop off

【答案】B

【解析】

考查動(dòng)詞短語(yǔ)辨析。句意：在煙灰落到地板上之前把它彈掉。A. cut off切（隔）斷；B. knock off停止做某事，下班，收工；C. get off 出發(fā)，離開，從……下來(lái)；D. drop off中途放下。knock off很形象的傳達(dá)了彈煙灰中“彈”的動(dòng)作。故選B。

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