单选题
成人英语三级
2017-03-25
请把最佳答案填入（ ）。
A．now and then
B．over and over
C．up and down
D．here and there
参考答案
C
答案解析
up and down“上下地”；now and then“偶尔”；over and over“反复，再三”；here and there“各处，到处”：点头表示“yes”，因此答案为C。
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