He didn't what I read because his mind was on something else.
A. hold on
B. catch on
C. take in
D. get over
网友回答
A. hold on
B. catch on
(答案→)C. take in
D. get over
解析:take in(=understand)理解。参阅Ⅲ。173注释。hold on(打电话时)不要挂断;catch on明白(作不及物动词用),catch on to懂得,明白(作及物动词用);get over克服。