单项选择题
A big dog ran in front of my mother's car and she（） stop very quickly.
A. ought to B. had better C. must D. had to
单项选择题 The boss （） already （） with the woman, who （）him her plan.
单项选择题 "None of them need do any work today, （） they" "Yes, all of them（）
单项选择题 The doctor was reading a test report when the patient （） in by a nurse.
