【題目】The police________ trying to_______ who the murderer is．

A. is，find B. are，find out C. is，work out D. are，look for

【答案】B

【解析】句意：警察正在努力查明殺人犯是誰(shuí)？the police“警察”，是集體名詞，作主語(yǔ)時(shí)，謂語(yǔ)用復(fù)數(shù)，故排除AC兩項(xiàng)。find找到；find out找出，查明；work out解決，算出；look for尋找。根據(jù)賓語(yǔ)從句who the murderer is可知此處表示要查明殺人犯是誰(shuí)，故選B。

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