My sister isn’t in. ________ she comes back, I’ll let her call you back.
A．WhileB．UntilC．BeforeD．When
D
本題的含義是我的妹妹不在家，當她回來的時候，我將叫她給你回電話，when表示當……時候，后句遇到將來用一般現(xiàn)在時來代替，故本題選D。
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