单项选择题

North American fur trade ______ in the early 1800' s mainly due to the diminishing number of fur-bearing animals.

A．ceased
B．staggered
C．waned
D．collapsed
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单项选择题
Educators are now recommending that reasoning skills ______ in the class room since recent tests indicate that many teachers in the past have ignored these skills.
A．are emphasized
B．must be emphasized
C．would be emphasized
D．should be emphasized
单项选择题
There is a real possibility that we could finish the task ahead of schedule, ______ enough time.
A．being there
B．there was
C．should there be
D．there having been
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