单项选择题

We had conducted hundreds of experiments______we finally achieved the desirable result.

A．after
B．before
C．since
D．until
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单项选择题
By the end of World War II , the drama theaters______to about thirty theaters in New York.
A．had been reduced
B．were reduced
C．have been reduced
D．reduced
单项选择题
______, Tom has lived alone for 10 years in Japan.
A．As is he a child
B．As he is child
C．Child as he is
D．A child as is he
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