单项选择题

We have still tremendous ( ) to overcome before we achieve our goal.

A．obligations
B．objections
C．obstacles
D．objects
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单项选择题
The new model costs twice ( ) last year’s.
A．more than
B．as much as
C．as many as
D．than
单项选择题
In other Words, all mammals, ( ) their sizes are, breathe once for every four heartbeats.
A．however
B．regardless
C．whatever
D．according
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