【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(kāi)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(shí)間點(diǎn),主句謂語(yǔ)動(dòng)詞是持續(xù)性動(dòng)詞,常與現(xiàn)在完成時(shí)態(tài)、現(xiàn)在完成進(jìn)行時(shí)態(tài)或過(guò)去完成時(shí)態(tài)連用。故B正確。

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