119. Artificial intelligence emerged during the late 1950’s as an academic discipline based on the assumption that computers are able to be programmed to think like people.

(A) are able to be programmed to think like people

(B) were able to be programmed to think as people

(C) can be programmed to think as people can

(D) could be programmed to think like people（D）

(E) are capable of being programmed to think like people do 我看大全詳解說~be able to be done必錯! 真的嗎?? 是說be able to 只能用於主動嗎?被動不好是嗎? 有人能解釋一下嗎~謝謝

be able to不用被动语态

权威解释来自og10－243: it is accurate to call humans “able”, but not to call those(amounts) “able”

ETS认为be able to是一个主动性很强的词，该词的逻辑主语必须具有发出be able to后动词的能力，如果是该动作的承受方

则一般都改成can/could