It is important to introduce children to healthy nutritious foods from ________ they begin to eat solids.
A．whatB．when
C．thatD．which
B
B　考查名詞性從句。句意：從孩子可以吃固體食物開始就引導(dǎo)他們食用健康營養(yǎng)的食物是很重要的。when在此引導(dǎo)賓語從句，作介詞from的賓語，且在從句中作時間狀語。
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