问题

she is not so cheerful _ she used to be?[ ]

A: How is it that; as
B: Why is it that; what
C: Is it why; that
D: How it is that; as

正确答案是：

同类题型

We believe scientists will ________a way tosolve the problem of air pollution.

Danielis the only one of the students in the class that never_____a mistake even whenit is pointed out to him

–Are you cleaning my roomI can’t help _____Ican’t bear seeing people’s room in a mess!

It’s unfair to discuss his case if he is not____.[]

The new technology, if____ to farming, will help increase the grain output.