英语21.-Will somebody go and get Dr White?

英语21.-Will somebody go and get Dr White?
21.-Will somebody go and get Dr White?
-He’s already been _______.
a.asked for b.sent for c.called for d.looked for
22.The number was brought in ,with his hands _______ behind his back.
a.being tied b.having tied c.to be tied d.tied
为什么