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.How long is it ______ we last spent the holiday in the country together?
A.untilB.beforeC.sinceD.that
C
考查时间状语从句。Until直到;before在......之前;since 自从;that不能引导时间状语从句。句意:自从我们上次一起在乡村度假,已经多长时间了?Since+一般过去时态的句子,主句用一般现在时态或现在完成时态。所以选C。
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