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15．You can only borrow two books if you don't have a library card．（　　）

	A．	on time		B．	in time
	C．	from time to time		D．	at a time

分析如果你沒有借書卡，你只能一次借兩本書．

解答答案：D．
首先明確選項中每個單詞或短語的意思，A：按時；B：及時；C：不時；D：一次；根據題干結合推測設空處句子的句意是"如果你沒有借書卡，你只能一次借兩本書．"，由此判斷句子中缺少"一次"一詞，故答案為D．

點評英語介詞的一個特點是一詞多義，并且介詞間語義交叉現象很多，習慣用法也很多，有時很難從詞義上區分開來．故學習中要注意不斷總結，熟記一些介詞和動詞的固定搭配用法及習慣用法，是完成此類問題的捷徑．

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