单项选择题

It was in Indonesia, the UN officials believe, ______ the tsunami (海啸) caused the greatest damage.

A．where
B．which
C．when
D．that
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单项选择题
______ seriously ill, you ought to go back to see her.
A．As your mother is
B．Your mother is
C．Being
D．Your mother being
单项选择题
Preparations are being made for the important meeting ______ soon.
A．held
B．holding
C．to be held
D．to hold
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