Babies often______down when they are learning to walk.

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问题 Babies often______down when they are learning to walk.

选项 A、drop
B、fall
C、slip
D、jump

答案B

解析 fall down“(因不小心等)跌倒,摔倒”;drop“落下,下降”;slip专指“滑倒”;jump“跳”。句意:婴儿学走路时经常跌倒。
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