问题

you look puzzled, Have youunderstood it—YesI _____another problem just now

A:would not catch
B:couldn’t have caught
C:haven’t caught
D:couldn’tcatch

正确答案是：

同类题型

Is there ____ “X” in the word “box”

Alice trust you: only you can ____her togive up the foolish idea.

23. Everyone should remember it is veryimportant to _____ the balance of nature toady.

I will never forget the song ________ she sang last night.

下列句中的加横线词，词类活用不同于其他项的是（）