单项选择题

Very few people understood her lecture, the subject of ______ was very obscure.

A．what
B．that
C．which
D．it
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单项选择题
When the whole area was ______ by the flood, the government sent food there by helicopter.
A．cut away
B．cut down
C．cut up
D．cut off
单项选择题
The manager ______ that the new employees go through professional training before they started working.
A．persisted
B．insisted
C．resisted
D．assisted
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