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【单选题】
关于红外光谱产生的条件，下列说法不正确的是（ ）A.
红外辐射的频率等于分子某个基团的振动频率
B.
辐射与物质间有相互偶合作用
C.
物质的偶极矩变化不为0
D.
物质的偶极矩没有变化
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A.
his ；him
B.
her ； her
C.
her ；him
D.
his ；her
【单选题】The boy promised ___ mother never to lie to ___ again.
A.
his, him
B.
her, her
C.
his, her
D.
her, him
【单选题】The boy promised ______late for school again.
A.
to not be
B.
not to be
C.
not being
D.
being not
【单选题】The boy promised _____ mother never to lie to _____ again.
A.
his ; him
B.
her ; her
C.
his ; she
D.
his ; her
【单选题】The boy promised______ in the exam any more.
A.
not to cheat
B.
not cheating
C.
to not cheat
D.
not to have cheated
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