单项选择题

They were enjoying themselves. ______, they appeared to be enjoying themselves.

A．However
B．Or rather
C．Furthermore
D．As a result
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单项选择题
The fireman managed to ______ the fire in time.
A．extinguish
B．prevent
C．stop
D．ruin
单项选择题
Before the first non-stop flight made in 1949, it ______ necessary for all planes to land for refueling.
A．would be
B．has been
C．had been
D．would have been
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