the reason i plan to go is____she will be sad if i don't.(because,that,thanks to,what)

问题描述:

the reason i plan to go is____she will be sad if i don't.(because,that,thanks to,what)

The reason I plan to go is (that) she will be sad if I don't.
这是个that引导的表语从句,that本身没有具体意思。
because不与reason连用,有赘述之嫌。
thanks to是归功于,归因于的意思,不符合语境。
what要在从句中充当主语或宾语等具体成分,并译为‘所...的事情’,这里也不符合语境。

what

that
she will be sad是that的内容