单项选择题

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

A．A number
B．who
C．study
D．steadily
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单项选择题
I (would rather) you (don't) (make any comment) (on) this problem.
A．would rather
B．don't
C．make any comment
D．on
单项选择题
In the (nineteenth) century, people (lived) in the northern area grew (their) crops on river (bottom lands).
A．nineteenth
B．lived
C．their
D．bottom lands
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