Half of the work ______ by now.
A. has finished              B. has been finished       C. have been finished
B
考查動(dòng)詞的被動(dòng)語(yǔ)態(tài)。 句意：一半的工作已經(jīng)被完成�？芍帽粍�(dòng)語(yǔ)態(tài)結(jié)構(gòu)，work是不可數(shù)名詞，所以用單數(shù)has been finished，故選B。
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