单项选择题

Mary, you () leave all your books on the floor like this!

A.wouldn't
B.mustn't
C.needn't
D.may not

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单项选择题

I won't be able to play outside with you tomorrow because I () my homework at that time.

A.shall have done
B.will do
C.will be doing
D.shall be done

单项选择题

() in the mountains for a week, the two students were finally saved by the local police.

A.Having lost
B.Lost
C.Being lost
D.Losing

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