问题

I have been living in the United States for 20 years, but seldom ________ so lonely as now.

A:have I felt
B:I had felt
C:I have felt/T
D:had I felt

正确答案是：

同类题型

It’s dangerous here. We must not letpeople fall down.–You’re right. Come on!

She won’t go to library tomorrow. ____

I have _______ work to do, and I am ________ tired.

Don’t shout at him. He _______.

Mary，______ here–everybody else，stay where you are.