【題目】How many trees ____ this year?

A. are planted B. will plant

C. have been planted D. planted

【答案】C

【解析】考查現(xiàn)在完成時的被動語態(tài)。今年已種了多少棵樹？表示到現(xiàn)在為止已種了多少樹。要用現(xiàn)在完成時。但樹是被種，故用現(xiàn)在完成時的被動語態(tài)。故選C。

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