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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—Tire patient looks much better．_____ is it that has made him _____ he is today?—Perhaps the special medicine and his family’s patient care．
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A
What; that
B
That; that
C
What; what
D
What; which
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
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A
to be based on
B
to base on
C
which to base on
D
on which to base
The patient’s son asked the doctor the question________his father could survive the big operation.
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A
whether
B
if
C
that
D
what
The prize will go to the writer ________ story shows the most imagination.
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A
that
B
which
C
whose
D
what