Thomas _____ in inventing many electrical machines
A．was successfulB．succeedC．was successD．successes
A
考查時(shí)態(tài)。句意：托馬斯成功的發(fā)明了許多電動(dòng)機(jī)器。結(jié)合語境可知本句描述的是過去的動(dòng)作，故用過去時(shí)態(tài)，選項(xiàng)C中，success是名詞，不能表示狀態(tài)，故選A。
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