Tom doesn't really know------captain

Tom doesn't really know______captain
A.whom of them he should make
B.who of them should he make
C.which of them he should make
D.who of them he should make.
为什么选C
不是指人吗 怎么又变成which了
Your father didn't take the medicine last night ,did he?
_______
A.No,but I wished he wouldn't
B No,but I wished he had
C.Yes but I wished he did
D Yes ,but I wished he wouldn't
为什么选Bhad?
而不用did
If he ______ his legs in the last training,he ______ in the coming World Cup,which he has been longing to compete in.[ ]
A.hadn't hurt； would join
B.didn't hurt； would have joined
C.didn't hurt； would join
D.hadn't hurt； would have joined
为什么选A 为什么用 过去完成时 如果不看前面一个 后面是不是都可以?