Mr. Smith is busy these days ________ a new book on how to develop a child’s reading skill.
A．working outB．working onC．working forD．working with
B
本題的含義是史密斯先生這些天正忙于寫一本有關(guān)培養(yǎng)兒童閱讀技能的書，work on表示忙于或從事的意思，符合本題含義，故本題選B。
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