单项选择题

He is still not here, he ________.

A．may miss his plane
B．could miss his plane
C．should have missed his plane
D．may have missed his plane
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Can you introduce the girl ________ the right to me
A．in
B．at
C．on
D．of
单项选择题
All substances, ________ , liquid or solid, are made up of atoms.
A．be they gases
B．whether they are gases
C．they are gases
D．they can be gases
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