问题
It took a great deal of courage to admit that all his efforts had been________.[ ]
A: in danger
B: in turn
C: in return
D: in vain
B: in turn
C: in return
D: in vain
正确答案是：
同类题型
The car is covered with so much dust.You’d better go and ________.— No,I’ll do it myself. [ ]
In part of China, some people still havedifficulty gaining to socialservices.
. She ought to stop work; she has aheadache because she ____ all day long.
I’m afraid I ______ return the book to you before Friday. — Take your time.