单项选择题
21()
A. understand
B. make
C. know
D. learn
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单项选择题
The boy ______ father is a famous scientist has won the prize.
A.who's
B.which
C.that
D.whose
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单项选择题
Never ______ such a bad accident.
A.I have seen
B.have I seen
C.will I see
D.I will see
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