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
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
C
take in(=understand)理解。 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。