题目内容：

I don'd know A,how many his telephone number B,what is his telephone number C,what his telephone nu
ber is

优质解答

C.what his telephone number is
我不知道他的电话号码是什么.
what his telephone number is是宾语从句,要用陈述语气.is要放在后面.排除B.
应当说电话号码是什么,即用what,而不能说电话号码是多少.排除A.