单项选择题

Tim stopped and stayed for a moment to _____ himself that he was not being followed.

A．insure
B．assure
C．confirm
D．confine
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单项选择题
She _____ her research into the cause of cancer in spite of financial problems.
A．carried away
B．put forward
C．consisted in
D．persisted in
单项选择题
Will you _____ it that this letter gets mailed today
A．see off
B．see to
C．look after
D．look into
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