Grandpa _______ (not,be) to the cinema since he _____ (break0 his leg last summer.

还是你呀，等着啊
hasn't been, broke,主句是现在完成时态，从句必用过去时。

Grandpa ___hasn't been____ (not,be) to the cinema since he __broke___ (break0 his leg last summer

典型的现在完成时和过去式搭配的句型

Grandpa has not been to the cinema since he broke his leg last summer.

Grandpa hasn't been(not,be) to the cinema since he broke (break) his leg last summer.