来自孙志伟的问题
【You______buysomereferencebookswhenyougotocollege.A.couldB.willhavetoC.mustto】
You______buysomereferencebookswhenyougotocollege.A.couldB.willhavetoC.mustto


【You______buysomereferencebookswhenyougotocollege.A.couldB.willhavetoC.mustto】
You______buysomereferencebookswhenyougotocollege.A.couldB.willhavetoC.mustto
你好.答案是B
语法原理:主将从现.
Youwillhavetobuysomereferencebooks(主句)+when+yougotocollege(从句).