单项选择题

I didn't hear the phone, I () asleep.

A．must be
B．must have been
C．should be
D．should have been

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单项选择题

-- Jane, what do you think of Mr Green -- As () teacher, he ought to set()good example to the pupils.

A．the; a
B．a; a
C．a; the
D．/; the

单项选择题

It worried her a bit () her hair was turning grey.

A．while
B．that
C．if
D．though

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