单项选择题

She ______ watched the film with her friends yesterday evening, but she was busy to go with them.

A．should have
B．had
C．must have
D．has
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At no time will China be the first nation ______ nuclear weapons.
A．used
B．which used
C．using
D．to use
单项选择题
His work ______, the porter felt tired out.
A．has finished
B．finishing
C．was finished
D．finished
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