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1.   Keys_________ used for__________ the doors.

A. is; opening        B. is; opened

C. are; opening        D. are; opened

 1.C考查固定搭配。be used for doing意為"被用來做……"，主語是keys，謂語動詞要用復數(shù)形式。

題目來源：同步導學案課時練九年級英語上冊人教版 > 階段檢測卷（六）

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