填介词,1,I am writing a book ____ American history.2,Please cover the table ___ a beautiful cioth .3,You'd better ask your teacher ___ help.

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填介词,1,I am writing a book ____ American history.2,Please cover the table ___ a beautiful cioth .3,You'd better ask your teacher ___ help.
填介词,
1,I am writing a book ____ American history.
2,Please cover the table ___ a beautiful cioth .
3,You'd better ask your teacher ___ help.

填介词,1,I am writing a book ____ American history.2,Please cover the table ___ a beautiful cioth .3,You'd better ask your teacher ___ help.
1.on
2.with
3.for