单项选择题

Something must have happened on their way here. Or they ______ by now.

A．should have arrived
B．should arrive
C．would have arrived
D．would arrive
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单项选择题
I am too busy these days. I would rather all of you ______ next month for a dinner.
A．come
B．would come
C．came
D．have come
单项选择题
No one can be sure if the cars on display fit him or her until he or she ______ them.
A．tries
B．will try
C．are trying
D．have tried
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