问题
选择题
It often happens that people with good eyesight fail to see is right in front of them.
A．which
B．that
C．what
D．as
答案
答案：C
考查宾语从句。从句中缺少主语，which不能单独充当主语，that不能用作句子成分，as不能用作主语，故选C，正在他们前面的东西。
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