【GMAT考满分语法SC题库】In the last 100 years, t_真题_答案

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In the last 100 years, the amount of sulfates in the atmosphere decreased considerably over the past century, while the concentration of greenhouse gases is more than twice what it was.

A
decreased considerably over the past century, while the concentration of greenhouse gases is more than twice what it was
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B
decreased considerably, while the concentration of greenhouse gases is more than double what it was at that time
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C
has decreased considerably, while the concentration of greenhouse gases has more than doubled
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D
has decreased considerably over the past century, while the concentration of greenhouse gases is more than twice what it was at that time
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E
has decreased considerably over the past century, while the concentration of greenhouse gases are more than double what they were
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正确答案: C

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