______ you are at home alone, please don’t leave the door open.
A．WhileB．As
C．BeforeD．How
A
考查連詞。While 當(dāng)什么時候，As 因為，Before 在什么之前，How 如何，怎樣，句意：當(dāng)你單獨一個人在加的時候，請不要讓門開著。所以選A。
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