2. 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

2.    B考查動(dòng)詞的時(shí)態(tài)。句霧：自人類開(kāi)始園藝的時(shí)期起，我們就一直努力把我們的環(huán)境變得更加美好。根據(jù)since的提示可知用現(xiàn)在完成時(shí)，再根據(jù)語(yǔ)境可知，動(dòng)作try從過(guò)去一直持續(xù)到現(xiàn)在，而且還要繼續(xù)進(jìn)行下去，因此用現(xiàn)在完成進(jìn)行時(shí)。

題目來(lái)源：2015全品語(yǔ)法快練高中英語(yǔ)新課標(biāo) > 訓(xùn)練15 動(dòng)詞的時(shí)（語(yǔ)）態(tài)和主謂一致

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