问题

It is well known to all that water, ______ enough, can change into ice quickly

A:if cooling
B:though to be cooled
C:when cooled
D:when is cooled

正确答案是：

同类题型

Tom has milk and bread __________ breakfast.

Would you like____to drink—Oh,I don’t want____.

I’d like to buy a skirt like this.—OK. We can buy a _____ one than this, but as nice as this.

Parents play a role in _________ their children.

Dad, can you tell me _______ in one hundred years–Sorry, that’s too difficult to imagine. The world is changing so fast!