Which of the following sentences has a subject-verb agreement error?
A. None of the books are interesting.
B. None of the books is interesting.
C. None of the books be interesting.
D. None of the books were interesting.

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A. The
B. One
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People can save money if they shop online because there are a lot of _____.
A. brands
B. designs
C. bargains
D. purchases
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Choose the correct option to complete the sentences:
Companies ____________ to deal with complaints quickly or they will lose customers.
___
A. need
B. must
