题目内容

John spent a lot of time ____________to his colleagues how challenging the priject was.（2019年12月第29题）

A. explain
B. explaining
C. to explain
D. explained

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If you have dimeulty_____________ your bills, tell your utility company as soon as possible.

A. pay
B. paid
C. to pay
D. paying

After the bargaining process _______________, a final agreement was signed.（2018年12月第22题）

A. is completed
B. had been completed
C. has completed
D. had completed

If people don't like________________ by titles, you can ask them how they prefer to be addressed.（2018年12月第30题）

A. are called
B. being called
C. be called
D. called

Generally speaking, you should arrive at the airport with plenty of time____________.（2018年6月第27题）

A. sparing
B. to spare
C. spare
D. spared