．How long is it we last spent the holiday in the country together?A. untilB. beforeC. sin

问题补充：

．How long is it we last spent the holiday in the country together?

A. until

B. before

C. since

D. that

答案：

A. until

B. before

(答案→)C. since

D. that

解析：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。