waiting for the bus.A. They both areB. They are bothC. They both will beD. Both they are

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A. They both are
(答案→)B. They are both
C. They both will be
D. Both they are
解析：all, both, each在句是位置相同，一般放在系动词后、实意动词前、助动词后或情态动词后。