英语的几道改错题～

1.Ever eince the world began,nations have difficulty in keeping peace with their nighbor.

错误是have difficulty 如何改？

2.I was just falling sleep last night when I heard a knock at the door.

错误是sleep,

3.Bats are able to guide them by producing sound waves too high for us to hear.

错误是to guide them

have had difficulty 用完成时
asleep
guide themselves

HAVE HAD DIFFICULTY

asleep

themselves

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