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1.Professor Smith did a very interesting experiment in his lab yesterday.(改为一般疑问句)
Did Professor Smithdo a very interesting experiment in his lab yesterday?

分析 史密斯教授昨天在他的实验室里做了一个很有趣的实验.
史密斯教授昨天在他的实验室里做了一个很有趣的实验吗?

解答 答案:Did; do  根据句子中"Preofessor Smith did…"中动词did和时间状语yesterday可知这是时态为一般过去时的句型.句子中did为实义动词do的过去式,改为一般疑问句应该以助动词did开头,谓语动词要用原形do,故填:Did; do.

点评 改为一般疑问句,首先判断句子的时态,选择合适的助动词、be动词或者情态动词开头,并要注意谓语动词形式的变化的.

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