【题目】The teacher asked Ben ________(answer) a question in class.

【答案】to answer

【解析】

句意:老师让本在课堂上回答一个问题。

空格处所给参考单词为answerask sb. to do sth.为固定搭配,意为“叫某人去做某事”,符合句意,故答案为to answer

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