Unless _________ by the police, you should keep silent over the accident.

A．a(chǎn)sked            B．a(chǎn)sk               C．being asked        D．having asked

 

【答案】

A

【解析】

試題分析：從by the police可以說明you與ask之間構(gòu)成被動(dòng)關(guān)系，故排除ＢＤ，另外非謂語動(dòng)詞的省略往往會省略從句的主語和部分謂語，即be動(dòng)詞，故選答案Ａ，也可以將狀語從句補(bǔ)全，即Unless you  are asked by the police,然后再去掉you are,即可得知答案。

考點(diǎn)：考查非謂語動(dòng)詞的省略。

點(diǎn)評：狀語從句的省略同時(shí)具備下列兩個(gè)條件:①主句和從句的主語一致，或從句主語為it；②從句主要?jiǎng)釉~是be的某種形式。從句中的主語和be動(dòng)詞常可省略

 

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