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【单选题】

All students are requested to be present at the meeting ______ in the school auditorium at 1:30 pm.

A.
being held
B.
having held
C.
to be held
D.
to hold
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参考解析:
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举一反三

【单选题】Madame Curie is believed _______ radium.

A.
discovering
B.
having discovered
C.
to have discovered
D.
to discover