问题

Not all the patents________ have been recognized.

A:to be examined
B:being examined
C:examined
D:having been examined

正确答案是：

同类题型

eryone is concerned about how toconquer the economic crisis, __________is very important for us to preserve ourstandard of living

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Amy likes _______ every day. She thinks it is good for her health.

In order to lose weight, the young lady prefers to ______regularly rather than take expensive weight-losing pills.

I have no choice but _____and sleep