Did you leave the doors and windows firmly______?You know there are many burglars there days.A to fasten B to be fastenedC fastened D fastening

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Did you leave the doors and windows firmly______?You know there are many burglars there days.A to fasten B to be fastenedC fastened D fastening
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Did you leave the doors and windows firmly______?You know there are many burglars there days.A to fasten B to be fastenedC fastened D fastening
Did you leave the doors and windows firmly______?You know there are many burglars there days.
A to fasten B to be fastened
C fastened D fastening

Did you leave the doors and windows firmly______?You know there are many burglars there days.A to fasten B to be fastenedC fastened D fastening
C 被动语态 而to be不定式表示将来.此为过去式

C
leave sth done指:让某物被什么
此句是:让门窗(被)锁好

c