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25.he must benear-sighted ______ he wears eye-glasses.

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25.he must benear-sighted ______ he wears eye-glasses.
A)should
B)as
C)for
D)because
答案为 C for
because 是指直接原因,导致近视的直接原因可不是因为戴眼镜
for 在这里虽然在汉语中可以译为“因为”,从逻辑上来讲,它其实是表结果的,即 【因为近视,他才戴眼镜的】,这种可以【倒因为果】的情况英语中只能用for.
再如:
He must have failed in the exam,for he is very sad.
比较:
He must have failed in the exam,because he is very lazy.