His jokes seemed______ but were in fact carefully prepared beforehand.A.simultaneousB.art

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His jokes seemed______, but were in fact carefully prepared beforehand.

A.simultaneous

B.artificial

C.spontaneous

D.substantial

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。