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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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
单项选择题
When Jane fell off the bike, the other children ______ .
A．were not able to help laughter
B．could not help but laugh
C．could not help to laughing
D．could not help to laugh
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