题目内容

The key point of his speech was that we should take effective measures ______________water pollution.（2019年12月第21题）

A. stopping
B. stop
C. stopped
D. to stop

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So far our company __________________exceptional lawn services to residential and commercial customers for 20 years.（2019年12月第22题）

A. will provide
B. had provided
C. provided
D. has provided

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

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