问几道英语单句改错的题.

问几道英语单句改错的题.
1The ancient Greek Olympic Games was held every four years.怎么改,哪里错了?
2Slaces and women were prevented competing.

1.改正：was → were
句子主语the ancient Greek Olympic Games为复数,所以谓语动词不能用三单was.
另：此题讲述的的确是过去的事实,所以还是应该用一般过去时.
2.改正：prevented和competing中间加入from
主动语态时,prevent sb/sth from doing sth中的from的确可以省略.
但是被动语态中,此from不能省略.

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