问题

ee, I’m poor in physics and you arenot good at chemistry, and……— That’s _______ we should help each other

A:am working
B:had been working
C:have been working
D:was working

正确答案是：

同类题型

I miss my parents very much. I’m seeing them again.

The plane is due to take off at 7：50 from the airport.—________ we fail to arrive there on time?—Try to take another flight then.

He still went to school on time ______ it rained heavily.

_____ lovely weather! –Yes! Just right for walking.

Is your father here’—No. He books in the study.