A knowledge of several languages is essential to the study of comparative literature because
without them one can read only in translation.
A.knowledge
B.without them
C.only
D.in

A.A.knowledge
B.without
B.only
D.in

【参考答案】

B
B代词错误，应改为it。因为前面的主语是aknowledge，是单数，因此后面用it来指代它。