How long__we take part in the college entrance examination?
only less than 1 year
A is it since B will it be before C is it when D will it be since
人气：107 ℃ 时间：2020-05-17 04:21:14
解答
这道题应该选BIt +is/has been +时间段+since +从句（一般过去时）It+was +时间段+since +从句（过去完成时) 这两个句型的中文意思都是自从...以来有多久了It +will +be +时间段+before从句.意思是要过多久.才.It +b...
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