摘要：21．Mary, I should tell you it is the third time that you your homework. A．forgot to do B．forgot doing C．have forgotten to do D．had forgotten doing
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Mary, I should tell you it is the third time that you________ your homework.
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A. forgot to do
B. forgot doing
C. have forgotten to do
D. had forgotten doing
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B. forgot doing
C. have forgotten to do
D. had forgotten doing