2. 专升本
  3. A man does not know the difficulty of anything______he does it personally.

A man does not know the difficulty of anything______he does it personally.

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问题 A man does not know the difficulty of anything______he does it personally.
选项 A、although
B、if
C、because
D、unless
答案D
解析 人只有亲自去做的时候才知道事情有多难。考点：连词辨析。unless意为除非，although意为尽管，if意为如果，because意为因为。
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