单项选择题

While the total number of farmers engaged in the agriculture production is barely half ______it used to be in 1959, the size of the average farm has tripled.

A．that
B．what
C．which
D．how
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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
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
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