单项选择（每题1分）In his letter was his promise _____ he would spend the Christmas Eve with me.
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A
that
B
what
C
which
D
whether
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My mother was looking while I the radio.
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A
listened to
B
have listened
C
was listening to
D
is listening to
The notice came around two in the afternoon ________ the meeting would be postponed.(2012·江苏)
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A
when
B
that
C
whether
D
how
After ______ was about then minutes, the teacher gave the students the correct answer to the question.
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A
what
B
that
C
it
D
which
The result of the survey shows successful people have in common is they all have confidence.
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A
whether; that
B
what; that
C
what; why
D
which; that