单项选择题

______ he come，the problem would be settled．

A．would
B．Should
C．Shall
D．If
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单项选择题
—Is that a book on farming If so，want to borrow ______． —Yes．it is．
A．this
B．it
C．one
D．the one
单项选择题
（），she may not catch up with her sister Lisa．

A．Hard though she works
B．Hard although she works
C．Hard works
D．Hard even if she works
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