单项选择题

(A number) of these (who) (study) engineering is improving (steadily).

A．A number
B．who
C．study
D．steadily
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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
单项选择题
Janson (he) was an idealist (who) refused to make any compromise (concerning) the (establishment) of the association.
A．he
B．who
C．concerning
D．establishment
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