问题

All _____ can be done has already been done.

A:/
B:what
C:that
D:which

正确答案是：

同类题型

In 1636, Harvard（哈佛大学）is one of the most famous universities in the United States.

James used _____ on the right in China, but he soon got used______ onthe left in England.

This is a _______ film and everyone feels _______ .

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