Your shirt needs ____. You'd better have it done today.

A．iron

B．to iron

C．ironing

D．being ironed

弹性变形，是指在外力作用下物体发生变形，外力卸去后，物体从变形状态（）到原来的状态。

A.能够完全恢复

B.部分恢复

C.不能恢复

D.不能确定