单项选择题

If it （）tomorrow, the match would be put off.

A．were to rain
B．was to rain
C．was raining
D．had rained

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单项选择题

The following are all dynamic verbs(动态动词) EXCEPT （）

A．remain.
B．turn.
C．write.
D．knock.

单项选择题

Which of the following sentences expresses a fact（）

A．Mary and her son must be home by now.
B．Careless reading must give poor results.
C．It’s getting late, and I must leave now.
D．He must be working late at the office.