Since the time humankind started gardening, we _____to make our environment more beautiful.
A．tryB．have been trying
C．a(chǎn)re tryingD．will try
B

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(diǎn),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(jìn)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。
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