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问题: 3道英语完形填空题

1.Can those __(seat)at the back of the
classroom hear me? --No problem

2.John received an invitation to dinner,and
with his work __(finish),he gladly accepted it

3.Don't use words,expressinos,or phrases__(know)
only to people with scientific knowledge.

解答:

1.seated
2.finished
3.known