A college student had stayed up all night, _______ for his test the next day.A．s_刷题宝

题干

A college student had stayed up all night, _______ for his test the next day.

A．studied

B．having studied

C．to study

D．studying

上一题下一题 0.64难度单项选择更新时间:2015-02-05 09:23:57

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