Robert is said abroad, but I don’t know in which country he is.A．have b
题型：不详难度：来源：
Robert is said abroad, but I don’t know in which country he is.| A．have been studying | B．to have been studying | C．have studied | D．to have studied |
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答案
| B |
解析
| be said后应该接不定式形式，而且根据I don’t know in which country he is 意味着他现在仍然在国外学习，表示从过去到现在一直在做某事，要用完成进行体。所以选B，不能选D. |
举一反三
_____ to sunlight for too much time will do harm to one"s skin. | A．Exposed | B．Having exposed | C．Being exposed | D．After being exposed |
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We should treasure friendship，for a friend is easier lost than ．
A．find B．to find C．finding D found |
_________good, the food was soon sold out.| A．Tasted | B．Being tasted | C．Tasting | D．Having tasted |
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O"Neal works hard. He is often seen _______ heavily before his teammates have even arrived at practice.| A．sweated | B．to be sweated | | C．sweating | D．being sweated |
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The manager has to get all these washing machines______________.| A．to deliver | B．be delivered | C．delivered | D．delivering |
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