问题
选择题
______ you'll be able to succeed mainly depends on ______ you do and ______ you do it.
A．If; what; why
B．Whether; how; why
C．That; whether; how
D．Whether; what; how
答案
答案：D
考查名词性从句。分析句子结构可知,第二空应该是做do的宾语,引导on后面的宾语从句,只能用what,第三空应该是do it的方式状语,用how,那么第一空则应该是个主语从句,一般疑问句改成主语从句只能用whether引导,不能用if。