单项选择题

The role that China plays in world affairs ______ getting more and more important.

A. have been
B. will be
C. is
D. are
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Betty, ______ has never been abroad, is studying English very well.
A. her
B. she
C. that
D. who
单项选择题
He wonders ______ the sound came from.
A. where
B. when
C. how
D. that
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