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It’s four o’clock in the afternoon. The boys __ in the pool.
A．is swiming B．a(chǎn)re swimingC．a(chǎn)re swimmingD．is swimming
C
根據(jù)前文的內(nèi)容. It’s four o’clock in the afternoon，可知答案為C，表示現(xiàn)在進行時。
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