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(   ) 10. Turn the bottle        to empty it before you fill it with something.

A. back and forth    B. up and down    C. upside down    D. now and then

10. C考查詞組的用法。back and forth來回地;up and down上下地,到處;upside down上下顛倒; now and then時不時地。句意:把瓶子倒過來倒空,然后再裝進別的東西。

題目來源:高考丟分題英語 > Unit 3 Under the sea

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