. He __________ full marks, but he was so careless as to make a spelling mistake
题型：不详难度：来源：
. He __________ full marks, but he was so careless as to make a spelling mistake.| A．must have gained | B．can have gained | C．could have gained | D．must gain |
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答案
| C |
解析
| 考查情态动词及虚拟语气。could have done本可能做某事而实际上没有做，句意：他本可以得满分的，但是他是如此的粗心以至于犯了一个拼写错误。所以选C。 |
举一反三
Don’t push me! __________ you know the truth right away? | A．Must | B．Could | C．Might | D．Would |
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——Alice looks sad. Did you tell her about the accident?
——Yes, but I ______ her just before her final examinations.| A．should have told | B．shouldn’t have told | C．needn’t have told | D．must have told |
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“Shall I come tomorrow ？” “I’d rather you ______.”| A．won’t | B．didn’t | | C．don’t | D．wouldn’t |
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“I’ve told him about it.” “But I’d rather you ______.”| A．didn’t | B．hadn’t | | C．don’t | D．wouldn’t |
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“He will take you as well.” “But I’d rather he ______.”| A．won’t | B．didn’t | | C．doesn’t | D．wouldn’t |
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