单项选择题

The board deemed it urgent that these files ______right away.

A．had to be printed
B．should have been printed
C．must be printed
D．should be printed
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单项选择题
There are many kinds of synthetic materials,______ plastics are the most common.
A．between which
B．of which
C．in which
D．among which
单项选择题
______to speak when the audience interrupted him.
A．Hardly had he begun
B．No sooner had he begun
C．Not until he begun
D．Scarcely did he begun
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