问题

He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.

A:why
B:how
C:because
D:whether

正确答案是：

同类题型

Can you give me _______ minutes

The police need some more evidence________they can make a conclusion

He told us whether _________

These new clothes______ to the children in the village tomorrow.

Would you like another cake It tastes sodelicious. —_____. I’m full.