问题

They have leading experts in this field，and that’s __________ they’ve made important progress

A:that
B:when
C:where
D:what

正确答案是：

同类题型

When_____the accident________?

We should forgive him for making such mistakes.—You are right,_______that he is only a new hand

It’s obvious that her refusing to see a doctor has______ her illness worsening.

t facts, a person can not form a correctopinion, for he needs to have actual knowledge ______his thinking

Mum didn’t go to bed _____ I came back home last night.