Don’t all stand up together! ________, please.
A．Each at one timeB．One at a timeC．One by one timeD．One for each time
B
句意：不要都站起來(lái)，請(qǐng)每次站起一個(gè)。at a time一次，每次，at one time一度，曾經(jīng)，所以選B。
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