The teacher together with the students discussing Reading Skills that newly published in

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A. are; were
B. is; were
C. are; was
(答案→)D. is; was
解析：
这题考查主谓一致，主语被together with/ with/ along with连接起来，主语和前面的主语一致，所以第一空用is，第二空是定语从句中的谓语和它修饰的先行词一致，先行词是Reading Skills是一本书，所以是单数用was。选D正确。