19. Tom,   you play the violin so well. But I

you can play the violin.

A. didn't know       B. don't know

C. hadn't known       D. haven't known

19.   A考査動詞的時態(tài)。句意：湯姆，你的小提琴拉得真好。但是我以前都不知道你會拉小提琴。根據(jù)句意作者表達的意思是"以前不知道你會彈鋼琴"而現(xiàn)在知道了。所以"不知道"應(yīng)為過去時態(tài)。故選A。

題目來源：2015全品語法快練高中英語新課標 > 訓(xùn)練14 動詞的時（語）態(tài)和主謂一致

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