He referred to his notebook whenhe gave the talk.A.now and thenB.for a whileC.he
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He referred to his notebook ________ whenhe gave the talk.
A.now and then
B.for a while
C.here and there
D.all over
试题答案
A
now and then 时不时for a while 一段时间 here and there 到处all over 到处,遍及