use,using,used, hear,hearing,heard He tried _a new microphone and was able to make himself .

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问题 use,using,used, hear,hearing,heard
He tried _______a new microphone and was able to make himself ______.

选项

答案using，heard

解析第一个空用try doing sth．来表示“尝试着做某事”；make oneself done意为“使自己被……”，make后常跟known／understood／heard等过去分词，用来表示“使自己被别人认识／理解／听到”。答案为using，heard。

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