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题库 / Prep2007E1-SC-23
While they remove carbon dioxide from the air, conserve soil and water, and house thousands of species, forests also supply potentially valuable pharmaceuticals, and, as sources of building material and firewood, that provide employment for millions worldwide.
pharmaceuticals, and, as sources of building material and firewood, that provide
pharmaceuticals, and sources of building material and firewood, are providers of
pharmaceuticals and, as sources of building material and firewood that are providing
pharmaceuticals and sources of building material and firewood, for providing
pharmaceuticals and, as sources of building material and firewood, provide
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D错在哪里？for在这种情况下只能翻作因为而不能是为了是吗？那如果for不要，这个选项对吗？
不。for只有身后是句子的时候（也就是for是连词的时候），才能表示“因为”。for不要也不对，这里的provide是和supply平行的。
为什么 forests可以 provide employment？ 不可以是 forests supply了pharmaceuticals 和 sources , (p和s平行)， 从而 导致 providing employment
mark~
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