单项选择题

(Mother) couldn't risk (to left) Baby (alone). She (should stay) with it.

A．Mother
B．to left
C．alone
D．should stay
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He (lived) in Beijing (since) 1980 to 1997, but he (is now living) (in) Shanghai.
A．lived
B．since
C．is now living
D．in
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(A number) of these (who) (study) engineering is improving (steadily).
A．A number
B．who
C．study
D．steadily
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