问题

.________ on the subject for half an hour,Liu Ying suddenly stopped.

A:You don’t seem
B:To work
C:Having worked
D:Having been worked

正确答案是：

同类题型

Is this the computer you want _________? [ ]

She has just paid ______ her loan from the bank.

No matter how fast we worked, ____.

You cannot tell________looking at someone whether or not he has HIV

He’samazingly cheerful considering all he’s had to __________.