单项选择题

No one knows who will call（）to solve the problem.

A.tune
B.tunes
C.the tune
D.a tune

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He was late（）the traffic jam.

A.as result
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C.as the result of
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A.great advancesin
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A.tell
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A.were questioned
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A.expand
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A.questioning
B.questioned
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A.lead
B.led
C.leading
D.to lead
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A.over-road
B.on-road
C.away-road
D.off-road
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A.essential
B.necessary
C.dominant
D.great
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He tried to hack（）the banking system.

A.to
B.on
C.into
D.for
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