_________six years since I began studying English.(B)

问题描述:

_________six years since I began studying English.(B)
A.They have been B.It is C.It was D.There are
为什么不是it was,后面不是began

你就记住since前面的语态比后面的低级
比如后面完成时,前面一定是一般式,
如果后面过去时,前面就一般式