Thomas in inventing many electrical machinesA. was successfulB. succeedC. was successD. s

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(答案→)A. was successful
B. succeed
C. was success
D. successes
解析：考查时态。句意：托马斯成功的发明了许多电动机器。结合语境可知本句描述的是过去的动作，故用过去时态，选项C中，success是名词，不能表示状态，故选A。