John ______ in his room when he heard screaming.A．is studyingB．studiedC．was stud_刷题宝

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John ______ in his room when he heard screaming.

A．is studying

B．studied

C．was studying

D．has studied

上一题下一题 0.64难度单项选择更新时间:2013-01-18 02:30:23

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