The research also raises the question ________ children from low-income, less educated families need earlier aid.
A．whatB．thatC．whenD．whether
D

試題分析：句意：這項(xiàng)研究也引起了這樣一個問題，那就是處于低收入，少教育的家庭的孩子是否需要早期的援助。這里含有一個同位語從句，且引導(dǎo)詞在從句中不作任何成分，但是有實(shí)際意義，表示“是否”，故用whether，選D。
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