Question

Three years has passed _________ they came to this school.

A．since

B．for

C．when

D．before

Answer 1

A

试题分析：句意：自从他们来到这所学校，时间已过去三年了。A. since自……以来；B. for 因为；C. when当......的时候 ；D. before在……以前。根据句意，故选A。