The doctor was busy writing an essay in ________ with his recent research.
A．touchB．connection
C．devotionD．comparison
B
B　句意：那名醫(yī)生當(dāng)時(shí)正忙于撰寫(xiě)與他最新研究有關(guān)的論文。in connection with“與……有關(guān)”，符合句意。
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