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问题详情：－IsJackinthenextroom?        －Well,it’shardtosay.ButIheardhim______at5o’clock.A.sing             B.tosing       C.sang                  D.singing...

问题详情：----IsJackinthenextroom?----Well,it’shardtosay.ButIheardhim______loudlywhenIpassedbyjustnow.A．speak                    B．tospeak                 C．spoken  ...