This special school has had more than 1,000 students ___ 1990.A.for B.since C.in D.during
问题描述：
This special school has had more than 1,000 students ___ 1990.A.for B.since C.in D.during
答
B has had 完成时态,用since. 如果是for,for 后面应该跟连续的时间..比如for three years. In 应该是过去时态.