The teacher told us that the gravity on Marsis (be) only about three-eighth of that on Earth．题目和参考答案——青夏教育精英家教网—

14．The teacher told us that the gravity on Marsis （be） only about three-eighth of that on Earth．

分析老师告诉我们在火星上的重力大约只有在地球上的八分之三．

解答答案：is
根据The teacher told us that 可知此句为宾语从句，that后面的内容做told的宾语，指老师告诉我们的内容；再根据the gravity on Mars…（be） only about three-eighth of that on Earth．可知告知的内容是客观事实和真理，所以后面的从句应该用一般现在时，在这种情况下不受主句时态的限制．由于从句的主语为the gravity（重力）为单数，所以be动词应用单数形式is．故填写is．

点评做此题注意两点：一是准确判断出从句所用的时态；二是准确判断出从句的主语，不要受Mars的影响．

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