问题

Is this the piano _______ yourfamiloy for over eighty years
A:once
B:when
C:while
D:as
B:when
C:while
D:as
正确答案是:
同类题型
You_____tothemeetingthismorningifyouhavesomethingimportanttodo
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______ to frighten the poor man, Mrs. Richards quickly hid in the small storeroom under the stairs.
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