Question

Mr. Wang has taught in our school _______ he came to Hainan.
A. when                B. for                 C. since          

Answer 1

C

解析试题分析：句意：王先生自从来到海南就在我们学校教书了。when当……时候；for因为，连接并列句；since自从，从句用过去时，主句用现在完成时。如：The Smiths have lived in China since he moved here史密斯一家人自从来到这里就住在中国。故选C。
考点：考查连词。