单选题
The idea (that) learning is (a) lifelong process (has expressed) by philosophers and educationalists (throughout) the centuries.
A、
that
B、
a
C、
has expressed
D、
throughout
【正确答案】
C
【答案解析】
[解析] 应改为has been expressed。本句中含有一个由that引导的一个同位语从句，修饰主语the idea，它和谓语动词express之间存在着动宾关系，所以要用被动语态。
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