单项选择题

The real trouble ______ their lack of confidence in their abilities.

A. lies in
B. lies on
C. results in
D. leads to
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From here people can see the bridge ______ construction.
A. below
B. by
C. under
D. on
单项选择题
The day ______ I shall never forget is the one ______ I joined the army.
A. that… where
B. when… in which
C. which… when
D. on which… why
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