Exactly______ the potato was introduced into Europe is uncertain, but it was pro
题型：不详难度：来源：
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.| A．whether | B．why | C．when | D．how |
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答案
| C |
解析
试题分析：考查主语从句的连接词。句意：准确的说，土豆是什么时候被传到欧洲的还不确定，但是可能在1565年左右。此处when引导主语从句并在从句中作主语。 |
举一反三
As John Lennon once said，life is_____ happens to you while you are busy making other plans.| A．which | B．that | C．what | D．where |
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You will never gain success________ you are fully devoted to your work.| A．when | B．because | C．after | D．unless |
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Lessons can be learned to face the future, ________ history cannot be changed.| A．though | B．as | C．since | D．unless |
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I don’t really like the author,_______ I have to admit his books are very exciting. | A．although | B．unless | C．until | D．once |
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It is difficult for us to imagine_____ life was like for slaves in the ancient world. | A．where | B．what | C．which | D．why |
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