he must be near-sighted _ he wears eys-glasses a.for b.because 请详细说明原因

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he must be near-sighted _ he wears eys-glasses a.for b.because 请详细说明原因
he must be near-sighted _ he wears eys-glasses a.for b.because 请详细说明原因

he must be near-sighted _ he wears eys-glasses a.for b.because 请详细说明原因
答案为 A 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.

a,for是说明原因但没有because那么清楚和强烈,because一般是用 because。。。。。

b.because 用for要这样he must be near-sighted ,for he wears eys-glasses

这里选择B.because, for有时候也可以和because互用,但for还带有"为了...,为..."的意思,所以此处不可以用for.
He wears eye-glasses for near-sighted.或者He wears eye-glasses because of near-sighted.