Question

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

Answer 1

C

解析試題分析：句意：王先生自從來到海南就在我們學校教書了。when當……時候；for因為，連接并列句；since自從，從句用過去時，主句用現在完成時。如：The Smiths have lived in China since he moved here史密斯一家人自從來到這里就住在中國。故選C。
考點：考查連詞。