单项选择题

Madame Curie is believed ______radium.

A．discovers
B．having discovered
C．to discover
D．to have discovered
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单项选择题
If the earth suddenly ______ spinning, we wouldn't do anything.
A．stopped
B．stops
C．has stopped
D．is stopping
单项选择题
He told me that nothing but toys ______ sold in this shop.
A．are
B．was
C．is
D．to be
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