As is known, ________we know some basic knowledge concerning AIDS, we can protectourselves from being infected.[ ]A. as far asB. if onlyC. so long asD. unle-高中英语-n多题

◎ 题干

As is known, ________we know some basic knowledge concerning AIDS, we can protect
ourselves from being infected.

[ ]

A. as far as
B. if only
C. so long as
D. unless

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◎ 解析

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◎ 知识点

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