单项选择题

Customers can contact a company representative to discuss their bill ______ by phone or by email.

(A) and
(B) either
(C) both
(D) nor
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单项选择题
Residents ______ wish to sign up for the Neighborhood Watch group should contact Sally Livingstone at 018-990-987.
(A) what
(B) which
(C) who
(D) whom
单项选择题
Highway 61 will be closed from Saturday evening until Monday morning, ______ motorists should use an alternative route.
(A) but
(B) so
(C) for
(D) even
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