单项选择题

Something terrible ______ to the company, the director has never looked so distressed.

A. may have happened
B. could have happened
C. should have happened
D. must have happened
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单项选择题
If you are plagued by any kind of ______ caller, you may ask the police for advice.
A. perspective
B. persistent
C. permanent
D. persuasive
单项选择题
I have heard him speak on several occasions that he would make sure you would ______.
A. come not to harm
B. come to being no harm
C. come to not harm
D. come to no harm
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