问题

I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.[ ]

A: what it is
B: what it does
C: what is it
D: why is it

正确答案是：

同类题型

__________ that the group of experts like them immediately.

crophone enabled them to keep intouch, in other words, it made it _____ for them to contact each other.

______ your jackets —Yes, they are.

Well. I do think the rabbit is a beautiful, gentle animal which can run very fast.—_____________.

I study math by ____ lots of exercises.