Paul found it increasingly difficult to hear, ______ his hearing was beginning to fail.
A、
and
B、
for
C、
but
D、
or
【正确答案】
B
【答案解析】
his hearing was beginning to fail是前一分句“听东西愈加困难”的原因，因此应选用可以表示原因的连词for引导原因状语从句。
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