单项选择题

______ , he couldn't solve the problem at that moment.
A) He was clever C) As clever he was
B) As he was clever D) Clever as he was
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单项选择题
I forget ______ the light in the office, so the lights in the office are still on. A) turning off C) to turn off B) having turned off D) turned off
I forget ______ the light in the office, so the lights in the office are still on.
A) turning off C) to turn off
B) having turned off D) turned off
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