单项选择题

All I can say about them ______ that they are the most competent engineers I have ever seen.

A．have
B．has
C．are
D．is
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单项选择题
______ of the machines on display were made in China.
A．Second-fifths
B．Two-fifth
C．Two-fifths
D．Second-fifths
单项选择题
Did you remember ______ your appointment last night
A．to keep
B．having kept
C．keeping
D．to have kept
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