题目内容

We must _______ that the experiment is controlled as rigidly as possible.

A. assure
B. ensure
C. secure
D. insure

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Nobody knows what _______ the change in his political thinking.

A. brought forth
B. brought about
C. brought out
D. brought up

I remember seeing him at a party, but I can’t _______ exactly where it was.

A. restore
B. know
C. recall
D. recognize

To keep society in good order, it is necessary that everybody ______ the laws.

A. accept
B. admit
C. concede
D. obey

依据课程,销售人员微信好友的增加最主要是通过（)。