单项选择题

A student is (allowed) to (enter into) this room (only) if a teacher (has given) permission.

A．allowed
B．enter into
C．only
D．has given
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单项选择题
I believe you have______ some important points in the report.
A．left alone
B．left behind
C．left off
D．left out
单项选择题
He abandoned a career that ______to his becoming one of the most influential people in the world.
A．could have led
B．will lead
C．should have led
D．must lead
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