问题

French is _______ difficult to learn.

A:kind of
B:it of
C:a lot of
D:kinds of

正确答案是：

同类题型

It never _____ humans until the mid1990s that some animals can be cloned

The natives could live for thousand years in the desert land _______ a foreigner could starve

Alice wanted to know ___ _ her grandmother liked the bag.

Our government has tried many ways to _________ the smog haze(雾霾) problem. Maybe we’llhave a clear sky in the near future.