When he knocked at the door, my mother was busy ____ supper.
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A
preparing for
B
in preparing
C
to prepare for
D
to prepare
推荐题目
There are three times __________.
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A
as many girls as boys
B
as many girl as boy
C
as many girls as boy
D
as many girl as boys
 Jack, I’m afraid I’ll turn to you.I think chemistry is _______ physics.
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A
as a difficult subject as
B
a subject the same difficult as
C
as difficult a subject as
D
the same difficult subject as