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单选题

74.()you change your mind, I won’t be able to help you.

A
 When
B
 Unless
C
 While

答案解析

正确答案:B

解析:

这道题考查的是连词在条件状语从句中的用法。我们需要分析主句和从句之间的逻辑关系来确定正确的选项。 **1. 句意分析** * **主句**:I won’t be able to help you.(我将无法帮助你。) * **从句**:( ) you change your mind.(( )你改变主意。) 结合语境,整句话的逻辑应该是:“**除非**你改变主意,否则我将无法帮助你。” 或者反过来说:“如果你不改变主意,我就帮不了你。” **2. 选项辨析** * **A. When (当……时候)** * 代入后句意为:“当你改变主意的时候,我将无法帮助你。” * 逻辑不通。通常如果对方改变了主意(比如从拒绝变为接受),说话者应该是“能”帮助,而不是“不能”。此外,when引导时间状语从句,不符合此处强烈的条件假设语气。 * **B. Unless (除非;如果不)** * `Unless` 相当于 `if ... not`。 * 代入后句意为:“**除非**你改变主意,(否则)我将无法帮助你。” * 等价于:“**If** you **don't** change your mind, I won’t be able to help you.”(如果你不改变主意,我就帮不了你。) * 这符合逻辑:只有在你改变主意的情况下,我才有可能帮你;如果不改,我就帮不了。这是最合理的语境。 * **C. While (当……时候;虽然;然而)** * 代入后句意为:“当你改变主意的时候/虽然你改变主意,我将无法帮助你。” * 逻辑同样不通顺,且 while 通常表示对比或伴随状态,不用于引导这种否定条件的假设。 **3. 结论** 根据句子的逻辑关系,这里需要一个表示“除非”或“如果不”的连词来连接条件。**Unless** 是最恰当的选择。 因此,正确答案是 **B**。
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