单项选择题

Since it is too late to change my mind now, I am ______ to carrying out the plan.

A. Obliged
B. committed
C. engaged
D. resolved

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单项选择题

Although he refused to act on my suggestion, he had to admit that ______ what I said.

A. it was something in
B. there was something in
C. it was something as for
D. there was something upon

单项选择题

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

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

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