【題目】Humans never know what progress they can make until they _______ very hard.

A. triedB. will tryC. is tryingD. have tried

【答案】D

【解析】

句意:人類直到他們非常努力嘗試后,才知道他們能取得什么進步。主句是一般現(xiàn)在時,until引導的時間狀語從句用一般現(xiàn)在時或現(xiàn)在完成時,結(jié)合句意,表示已經(jīng)從嘗試后,現(xiàn)在才知道自己能取得什么進步,故用現(xiàn)在完成時have tried。故選D。

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