单项选择题

I happened ______ when the telephone rang.

A．rut
B．to be out
C．being out
D．be out
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单项选择题
______ some mammals came to live in the sea is not known.
A．Which only
B．Since
C．Although
D．How
单项选择题
My brother is now working ______ he did last year.
A．much harder than
B．more harder than
C．much than
D．much than
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