[ Grammar ]
We ……. all of the brochures to customers. Can you order some more?
A. have sended
B. have send
C. have sent
D. has sent

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Modals › ViewMum, ________ I go to the library?
A. must
B. shouldn’t
C. can
D. ought to
Grammar › View
I know the reasons.
A. grammatically correct
B. grammatically incorrect