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【单选题】
某一旋光性物质的分子中含有 2 个不同的手性碳原子,其旋光异构体的个数为A.
2
B.
3
C.
4
D.
5
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举一反三
【单选题】2005福建，33） When_______help, one often says “Thank you.” or “It’s kind of you”.
A.
offering
B.
to offer
C.
to be offered
D.
offered
【单选题】When ______ help, one always says “Thank you” or “It’s very kind of you”
A.
offering
B.
offered
C.
to offer
D.
offer
【单选题】When _____ help,the poor beggar always says 'Thank you' millions of times. [ ]
A.
to be offered
B.
offering
C.
to offer
D.
offered
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