Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.

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问题 Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.

选项 A、sinking behind
B、falling behind
C、drawing behind
D、crawling behind

答案B

解析这里词组fall behind相当于lag behind／get behind／drop behind／be behind：落后。

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专业英语四级

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