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问题:

[单选]
John________  he could improve his exam results, but he did not have enough time to study.

A . knows how
B . knows that
C . knew how
D . knew that

________ their luggage, the tourists hurried to the airport. Packed。 After packed。 Having packed。 Packing。 The development of the light bulb ________partly as a result of the widespread availability of electricity and the need for cheap, clean light. occurring。 was occurring。 was occurred。 occurred。 It is a small country, yet has a lot of________ resources. potential。 unknown。 secret。 unlimited。 How can he do so much work? He ________ stay late at the office every evening and take work home at weekends. need。 can。 might。 must。 It is often easier to make plans than to ________ them out. put。 carry。 take。 practice。
John________  he could improve his exam results, but he did not have enough time to study.
参考答案:

  参考解析

考时态和连词。根据从句可判断为过去时,排除选项A和B。how表示如何,符合题意。选项C是正确的。【句子大意】约翰知道如何提高考试成绩,就是没有足够的时间学习。

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