题目内容

Not until I got to the airport _______________ that my passport was missing.（2019年12月第24题）

A. had I realized
B. will I realize
C. I will realize
D. I had realized

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If I _____________his email address, I would have sent him a message yesterday.（2019年12月第26题）

A. have known
B. had known
C. will know
D. know

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

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