问题

ys followed the marks that they ________, untilfinally they found their way back to the campsite.

A:left
B:haveleft
C:hadleft
D:have been left

正确答案是：

同类题型

The manager told us that _______ careful we are, ________ mistakes we’ll make

Can you guess _________the iPhone4s yesterday—- Sorry, I’ve no idea about it.

________ I’m __________ about the workI’m not strong enough for it

I had trouble the problem.

What happened _____ them