问题描述：
1.It is two years ＿I joined the army.A.before B.since C.that D.after
2.It was two years＿I joined the army.
A.before B.since C.that D.after
老师说的是第一题选B,第二题选A.他没讲清楚,没搞懂.
这两个句子到底是怎么回事啊,为什么不能用that?
2.It was two years＿I joined the army.
A.before B.since C.that D.after
老师说的是第一题选B,第二题选A.他没讲清楚,没搞懂.
这两个句子到底是怎么回事啊,为什么不能用that?
问题解答：
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