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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单项选择题
They will be very thankful for ______ you can give them.
A．that
B．which
C．when
D．whatever
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
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