单项选择题
49()
A.appeared
B.changed
C.evolved
D.produced
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Jim used to think that the more time he spent on his studies, the better grades he would receive. But now he has realized that it is not always the case.
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单项选择题
The element carbon is (widely) (found) (in nature) in many forms including both diamonds (as well as) coal.()
A. widely
B. found
C. in nature
D. as well as
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