There are certain ________ when you must interrupt people who are in the middle

There are certain ________ when you must interrupt people who are in the middle

题型:月考题难度:来源:
There are certain ________ when you must interrupt people who are in the middle of doing something.[     ]
A.conditions  
B.situations
C.occasions  
D.environment
答案
C
举一反三
I"m sorry that I can not accept your ________ to attend your birthday party, Linda, because
I"m ________ to answer all the customers" letters tonight by my boss. [     ]
A. requirement; required
B. demand; requested
C. request; asked
D. request; required
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