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【題目】Since the time humankind started gardening, we _____to make our environment more beautiful.
A.try
B.have been trying
C.are trying
D.will try

【答案】B
【解析】句意:自從人類開始園藝,我們一直盡力使我們的環(huán)境更美麗。since 作為介詞,后接某一確定的時間點,主句謂語動詞是持續(xù)性動詞,常與現在完成時態(tài)、現在完成進行時態(tài)或過去完成時態(tài)連用。故B正確。

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