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【单选题】
某旋光性物质中含2个不相同手性碳原子,其旋光异构体的数量为A.
2
B.
4
C.
6
D.
8
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A.
sister
B.
sisters
C.
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D.
sister's
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【单选题】 Look, they ________ a good time in the garden.
A.
are having
B.
have
C.
have had
D.
had
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