Paul had to write a history paper, _____ he couldn’t find time to do it.A．butB．
题型：不详难度：来源：
| Paul had to write a history paper, _____ he couldn’t find time to do it. |
答案
| A |
解析
| 考查连词：A. but但是，B. so因此，C. because因为，D. if如果，句意是：Paul得写一篇历史论文，但他找不到时间写。选A。 |
举一反三
___we do this today or tomorrow doesn’t make much difference.| A．When | B．Whenever | C．Whether | D．If |
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With some technical problems to be solved, it may be a while the system is put into use.| A．when | B．after | C．since | D．before |
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He tried his best to solve the problem, ______ difficult it was.| A．however | B．no matter | C．whatever | D．although |
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