单项选择题

There are so many books that I'm not sure which ______.

A. choosing
B. choose
C. to choose
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单项选择题
I wonder ______ you are willing to the party.
A. if, to come
B. whether, come
C. if, coming
单项选择题
I Let's play basketball some time. —Good idea! What ______ this afternoon
A. shall you do
B. are you going to do
C. will you do
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