问题
When I try to understand ________ that prevents so many children from being happy, there seem to be three causes.
A:why it is
B:what it does
C:why it does
D:what it is
B:what it does
C:why it does
D:what it is
正确答案是：
同类题型
My recorder is broken. Could I useyours? —_______, but you have to return it tomorrow.
No one________ be more generous；he has a heart of gold.
Didn’t the guard see him breaking into the bank?—No, he ______ in the other direction
It saves time in the kitchen to have things you use a lot _______ easy reach.