问题描述：
As you know,I am a disabled man,but I would be happy if I ___of service to you.
A.am
B.have been
C.should be
D.would be
选什么啊?顺便解释一下!
A.am
B.have been
C.should be
D.would be
选什么啊?顺便解释一下!
问题解答：
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