题目内容

I can’t help _________that it was a mistake to let him go.

A. thinking
B. A) thinkingB) thinkC) thoughtD) to think
C. think
D. thought

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After studying Unit One, we all _________to improve our study habits.

A. set down
B. set off
C. set up
D. set out

You’re bound to make a few mistakes through _________.

A. experience
B. experienced
C. inexperience
D. inexperienced

His classmates tried to dissuade him _________swimming across the lake, but he did not listen.

A. from
B. to
C. at
D. in

_________the fire was discovered soon after it had started.

A. Fortunate
B. Fortunately
C. Unfortunate
D. Unfortunately