单项选择题

A heavy stone ______ his leg.

A． fell on
B． fallen down
C． knocked down
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单项选择题
Can I ______ your book for a minute I left mine at home.
A． lend
B． keep
C． borrow
单项选择题
My brother is only six, ______ he can play piano very well.
A． and
B． because
C． but
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