题目内容
【题目】They have studied in this school .
A.since three years ago
B.three years ago
C.for three years ago
D.since three years
【答案】A
【解析】句意：他们在这个学校学习……根据句意可知应该此处是他们已经在学校学习三年了，故选A。
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题目内容
【题目】They have studied in this school .
A.since three years ago
B.three years ago
C.for three years ago
D.since three years
【答案】A
【解析】句意：他们在这个学校学习……根据句意可知应该此处是他们已经在学校学习三年了，故选A。