问题
选择题
Do not let any failures discourage you, for you can never tell ______close you may be to success.
A．how
B．that
C．which
D．where
答案
A
题目分析：句意：不要让失败阻挠你，因为你不能辨别你离成功有多远。Tell后面是宾语从句，宾语从句中修饰close用how，所以选A.
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