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【題目】To keep children away from danger, we warn parents ___________ children at home alone.
A.leaveB.to leaveC.not leaveD.not to leave
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【題目】Ifyoucan'topenthefrontdoor,whynot______thebackone?
A.totryopeningB.tryingtoopen
C.totryandopenD.tryopening
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