问题
选择题
He found it increasingly difficult to read，________ his eyesight was beginning to fail.
A．though
B．for
C．but
D．so
答案
答案：B
for在此引出表示原因的并列分句。
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He found it increasingly difficult to read，________ his eyesight was beginning to fail.
A．though
B．for
C．but
D．so
答案：B
for在此引出表示原因的并列分句。