—What’sthematterwithyou?—Afterthelongwalk,mylegs________andIcouldn’tgo

—What’s the matterwith you?—After the longwalk, my legs ________ and I couldn’t go any further.A.gave outB.gave offC.gave inD.gave up

A解析give out用尽，精疲力竭；give off发出（蒸汽、光等）；givein投降，屈服；give up放弃。

就是这个解释