One day a dentist was【B1】his morning work. Suddenly a man ran【B2】His face was red and he could【B3】say: "Quick! Quick!"【B4】dentis

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问题 One day a dentist was【B1】his morning work. Suddenly a man ran【B2】His face was red and he could【B3】say: "Quick! Quick!"【B4】dentist thought he must【B5】very ill. His assistant helped to make the man【B6】in a chair. The dentist gave the man【B7】medicine to make him sleep. Then he【B8】the man’s mouth and pulled out all the bad teeth.【B9】the man woke up, he said in a low【B10】, "Quick, doctor! Quick!"

选项 A、starts
B、starting
C、started

答案B

解析 be starting(to do)sth.是固定表达,意思是:“正准备作某事”,用进行时表将来时的含义。
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