The author thinks that crime is increasing in cities because In the first sentence the author means that

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问题 The author thinks that crime is increasing in cities because
In the first sentence the author means that

选项 A、it is easy to say "I love you"
B、it is hard to say "I love you"
C、we have many troubles in our life
D、people usually do not know when to say "I love you"

答案D

解析细节题。“You must have been troubled by when to say‘I love you’because it is one of the greatest puzzles in our life．”即“你一定曾经为何时说‘我爱你’而烦恼过，因为这是我们生活中的一大难题。”也就是说人们为何时说“我爱你”而烦恼。故选择D。

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本试题收录于：公共英语二级笔试题库公共英语（PETS）分类