单项选择题

He achieved success through hard work().

A. reached
B. reaped
C. attained
D. took

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单项选择题

We explored the possibility of closer trade links at the conference.()

A.rejected
B. investigated
C. proposed
D. postponed

单项选择题

I am sure to tell you that there's no danger().

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

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