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Half of the work ______ by now.
A. has finished              B. has been finished       C. have been finished
B
考查動詞的被動語態(tài)。 句意：一半的工作已經被完成。可知要用被動語態(tài)結構，work是不可數名詞，所以用單數has been finished，故選B。
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