His eyesight must be poor, for, as he reads, he bends down ______his face is quite near the printed page.

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问题 His eyesight must be poor, for, as he reads, he bends down ______his face is quite near the printed page.

选项 A、unless
B、until
C、since
D、as if

答案B

解析 本题考查介词辨析。由“他的视力一定很差”可知,他看书的时候弯腰使脸离书本很近。until(直到)能够使空前后语义及逻辑通顺,故答案为[B]项。unless(除非,如果不),since(因为,既然)和as if(好像)均不能使语义及逻辑通顺,故均排除。
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