3must 必须 & have to 不得不（客观客观被迫）区分
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（）1. You ______ follow the school rules. The teacher orders all students to do it.
A. must
B. has to
C. must to
D. have to to
（）2. My mum is ill. I ______ look after her at home today.
A. must
B. musts
C. have to
D. has to
（）3. Tom ______ finish his homework before dinner. His parents make him do it every day.
A. have to
B. has to
C. must to
D. musts
（）4. We ______ wear safety helmets when riding bikes. It’s the traffic law.
A. has to
B. must to
C. musts
D. must
（）5. It’s raining heavily. She ______ take the bus to school.
A. has to
B. must
C. must to
D. have to
（）6. You ______ stop when the traffic light is red. Everyone should obey this rule.
A. has to
B. have to to
C. must
D. musts
（）7. I missed the last bus, so I ______ walk home now.
A. must
B. have to
C. has to
D. must to
（）8. He ______ get up early tomorrow, because his train leaves at six.
A. must
B. must to
C. have to
D. has to
（）9. Students ______ keep quiet in the library. It’s the library rule.
A. must
B. has to
C. have to to
D. musts
（）10. My bike is broken. I ______ ask my dad to drive me to school.
A. must
B. has to
C. have to
D. must to
（）11. —______ I hand in the report today?
—Yes, you must.
A. Have to
B. Must
C. Must to
D. Has to
（）12. He doesn’t ______ wear glasses at home, but he has to wear them outside.
A. must
B. has to
C. must to
D. have to
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