问题描述:
Mary has been playing the guitar for two hours.(改为一般疑问句) ---- Mary ----- playing the guita
Mary has been playing the guitar for two hours.(改为一般疑问句)
---- Mary ----- playing the guita for two hours?
Mary has been playing the guitar for two hours.(改为一般疑问句)
---- Mary ----- playing the guita for two hours?
问题解答:
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