问题

,you play so well. But I ______ you played the piano.

A:didn’tknow
B:hadn’t known
C:don’tknow
D:haven’t known

正确答案是：

同类题型

Let’s go and______ hello to Mr. Clark. —OK, let’s go.

We happen to age.

We consider ____ absolutelynecessary that we should open our door to the outside world

Four o’clock in the morning?-What? Oh, no, don’t ring me up that early. I ________.[ ]

Not until I shouted at the top of my voice ______ his head.