It may not be a good habit to look up the dictionary whenever you______a difficult word while reading.

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问题 It may not be a good habit to look up the dictionary whenever you______a difficult word while reading.

选项 A、come at
B、come across
C、come along
D、come up

答案B

解析 本题考查come的词组辨析。come at,达到,弄清楚;come across,遇到,碰到;come along,一起走,随之而来;come up,上升。句中的意思是指遇到生单词,所以答案选B。
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