（)could have been more annoying.

You should have been more patient ________ 怎么选择

【C17】A．must have beenB．may have beenC．could have beenD．should have been

Women have long been more in number than men on college campuses. They also hold more adva

With a little more patience, you （) the job better.A、could doB、would doC、could have done

Large-scale hydroelectric power stations have been playing a more and more important part

Lucan could have been killed because people______