问题

I have got a headache. — No wonder. You_________ on the mathexercises too long.
A:work
B:areworking
C:have been working
D:worked
B:areworking
C:have been working
D:worked
正确答案是:
同类题型
The speech given by Primer Wen Jiabaoshowed ______ broad knowledge he has.
"Do you know ________ " "Hisfather is a doctor."
It has been five years since the party _____Many people wonder whether it will stay on.
Why don’t you use the knife—It needs ___________________.
He is famous both _________a novelist andpoet but he is more famous_________ his novels.