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SAT IS题The problem of water pollution,frequently compounded(

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SAT IS题
The problem of water pollution,frequently compounded(是动词?还是过去分词做状语?如何区分呢?) in certain areas because the treatment and release of industrial wastes are not adequately regulated.(P954.2)
\x05(A) pollution,frequently compounded in certain areas because
\x05(B) pollution,frequently compounded in certain areas and\x05
(C) pollution,frequently compounded in certain areas when
\x05(D) pollution is frequently compounded in certain areas where
(E) pollution is frequently compounded in certain areas and 为什么?
答案当然是D, 首先,因为要保证主句结构,所以ABC都不对,不然的话the problem就没有动词了.后面作为伴随地点修饰所以用where.
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