Please make sure all the lights are ______ before you go to bed.
A．turned onB．turned downC．switched offD．switched on
C
短語辨析。   A.打開    B.減��；調(diào)低    C.關(guān)掉；切斷電源 D. 開啟。句意：請(qǐng)確認(rèn)在你睡覺前所有的燈都被關(guān)掉了。這里強(qiáng)調(diào)是關(guān)掉電源。故選C。
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