单项选择题

In the long run, English learning, difficult as it is, is ______ to a learner iii his or her career devel- opment.

A．profitable
B．advantageous
C．prominent
D．rewarding
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单项选择题
It really ______ to witness such an enormity can occur in the so-called civilized society.
A．pains her
B．makes her pain
C．is paining
D．is pained
单项选择题
She ought to make a shift now; she is in a bad mood because she ______ in the dull work too long.
A．had engaged
B．is engaging
C．has been engaging
D．engaged
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