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When you are _______ about which button to press on the complicated machine, you can either read the user’s guide for guidance or fax us for specific instruction. Don’t ______ the trial-and-error method.

A.insure; do

B.ensure; make

C.uncertain; try

D.unsure; touch

高三英语单项填空中等难度题

少年,再来一题如何?
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