题目内容

负面情绪对人们是无益的

A. 对
B. 错

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So far our company _____ exceptional lawn services to residential and commercial customs for 20 years.

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

______ you want some samples for our new products, you might contact our sales manager.

A. If
B. Whild
C. Until
D. Although

As a sales person, _____ John lacks his confidence when he is talking with clients.

A. which
B. what
C. why
D. that

If I _________ his email address, I would have sent him a message yesterday.

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