问题
单项选择题
After he has written his paper, he found some additional material______he should have included.
A．that
B．of which
C．in which
D．whom
答案
参考答案：A
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After he has written his paper, he found some additional material______he should have included.
A．that
B．of which
C．in which
D．whom
参考答案：A