问题

you look puzzled, Have youunderstood it—Yes．I _____another problem just now．

A:l have thought of
B:am thinking of
C:had thought of
D:was thinking of

正确答案是：

同类题型

Mr Chang has ________money but _______friends than Mr. Chan.

The running water makes the stones _____ very smooth.

Has your teacher returned from America yet? –Yes, but he _______ here for only three days before his company sent him to Africa

The plan for a field travel ______ by our teacher last night.

__ warm at night, I would fill the woodstove,then set my alarm clock for midnight so I could refill it.