问题

Zhangqiang is said ______ the experiment in the lab,but I can’t find him there.

A:to have done
B:to do
C:to be doing
D:doing

正确答案是：

同类题型

te of the thunderstorm, the childrenslept _____ all night.

use, for _______ he paid $10, 000, isnow worth $50, 000.

I haven’t seen her _____

The study surveyed 500 families and found the mainproblem people suffered was tiredness, followed by loneliness and anxiety.

_____ you please play tennis with me —Sorry, I _____.