单项选择题

Very little ______ they had made an important discovery in science.

A．they realized
B．they realized what
C．did they realize
D．did they realize what
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单项选择题
From this library we can borrow ______ many books as we want to read.
A．that
B．such
C．as
D．too
单项选择题
The DNA test, together with other tests, ______ the prisoner's innocence.
A．proves
B．prove
C．proving
D．have proved
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