问题

__________he was busy, _________he often helped us with our studies.
A:is
B:are
C:be
D:am;
B:are
C:be
D:am;
正确答案是:
同类题型
I’ve tried very hard to improve my English.But by no means ________ with my progress.
It’s quite hot in the room. You’d better the windows or the door.
Now_____ in your account of the news story.I dare say it’s really a tough job.
I suggest that that we should take part in more such activities in future ________we did yesterday.