题目内容

The twins has studied in this school  ________    .
A．two years agoB．since two years ago
C．for two yeas agoD．since two years
B

试题分析：在表示时间时，ago前加一段时间，表示多久之前，用于一般过去时态。Since后接一个时间点，表示自……以来，用于完成时态。For后接一段时间，用于完成时态，和持续性动词搭配使用。句意：这对双胞胎自从两年前就在这所学校学习。结合语境可知选B。
点评：解答此类题型的要点是了解各个短语的基本含义及用法的不同，同时注意其表示多个含义的现象，然后结合语境选择合适答案。
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