问题

Don’t make a noise! They _______on a physics problem now.
A:will work
B:are working
C:worked
D:have worked
B:are working
C:worked
D:have worked
正确答案是:
同类题型
He didn’t stay up late last night. — ________. [ ]
Will she ________ go with you? –Well, I’m not sure.
Mr. Yang’s daughter is pretty good_____ drawing pictures and won many prizes.[ ]
What’s wrong _____ you?—I can’t find my way home.[ ]
The radio says the weather will get _______ later in the day, so we have to stay at home.