单项选择题

"The car ran out of gas!""That ______ the cause. I filled the tank this morning."

A．mustn't be
B．must have been
C．can be
D．can't have been

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单项选择题

Out of the elementary plane geometry developed by the Greeks ______ we use today.

A．the theoretical geometry evolution
B．evolved the' theoretical geometry
C．the evolution of theoretical geometry came
D．the theoretical geometry came

单项选择题

We had to go miles to find a restaurant, it ______a holiday.

A．being
B．was
C．to be
D．is

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