高考英语形容词练习41
题目内容

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.      

2021-08-06

A.insure; do

B.ensure; make

C.uncertain; try

D.unsure; touch

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