问题
选择题
| The teacher told us ______. |
A. don't play on the road B. not be late again C. come to school on foot D. to cross the road carefully |
答案
答案：D
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| The teacher told us ______. |
A. don't play on the road B. not be late again C. come to school on foot D. to cross the road carefully |
答案：D
（1）指出配合性质（2）求配合时的极限间隙或极限过盈。