There ____________ always three lights in every country: red, yellow ____________ green.

A. is; and
B. are; and
C. are; or
B
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科目：小學(xué)英語 來源：同步題 題型：單選題

There ____________ always three lights in every country: red, yellow ____________ green.
[     ]
A. is; and
B. are; and
C. are; or

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