单项选择题

The woman ______ herself to doing scientific research.

A．took
B．assigned
C．arranged
D．committed
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单项选择题
They are busy ______ in their lessons before the exam.
A．going after
B．going over
C．going by
D．going ahead
单项选择题
If I ______ an umbrella with me, I wouldn't get wet on that rainy day.
A．took
B．had taken
C．take
D．am taking
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