While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.A.now and thenB.over and overC.up and downD.here and there
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A解析试题分析：词义辨析。A时而不时；B一再；C上上下下；D到处。句意：当打字的时候，Helen有一个习惯，她会时而不时地停下来，理顺一下她那长长的头发。根据句意说明A正确。考点：考查词义辨析点评：词义辨析需要在平时的教学中加强记忆。注意归类总结。