单项选择题

Our journey was slow because the train stopped _________ at different villages.

A．gradually
B．unceasingly
C．continually
D．continuously
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单项选择题
I hope the plan will work, but they themselves are very _________that it will.
A．doubtful
B．suspicious
C．suspect
D．dubious
单项选择题
There are certain _________when you must interrupt people who are in the middle of doing something.
A．occasions
B．conditions
C．environments
D．situations
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