Since the time humankind started gardening, we _____to make our environment more beautiful.

A. try B. have been trying

C. are tryingD. will try

 

B

【解析】

試題分析:考查動詞時態(tài)。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(xiàn)在完成時態(tài)、現(xiàn)在完成進行時態(tài)或過去完成時態(tài)連用。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。故B正確。

考點:考查動詞時態(tài)

 

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