问题
Why didn’t Susan come to school? —I don’t know. She____ ill.
A:could be
B:may have been
C:might
D:must have been
B:may have been
C:might
D:must have been
正确答案是：
同类题型
It’s very kind Betty to give us a hand.— That’s true. We should thank her helping us out.
I don’t like living in the cities, because the cost of living is _______.
The poor man, ______, ran out of the dark cave.
What does the model plane look like? — Well, the wings of the plane are _____ of its body [ ]