单项选择题

______that a society like the National Society for the Prevention of Cruelty to children is still needed in a civilized country.

A．How does it come
B．How it comes
C．How did it come about
D．How did it come
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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
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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