Paul had to write a history paper,  _____ he couldn’t find time to do it.
A．butB．soC．becauseD．if
A
考查連詞：A. but但是，B. so因此，C. because因?yàn)椋珼. if如果，句意是：Paul得寫一篇?dú)v史論文，但他找不到時(shí)間寫。選A。
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