Cars, buses and bikes ______ stop when the traffic light is
| Cars, buses and bikes ______ stop when the traffic light is red. |
| [ ] |
| A. must B. can C. may D. need |
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你能帮帮他们吗
| Cars, buses and bikes ______ stop when the traffic light is red. |
| [ ] |
| A. must B. can C. may D. need |
你能帮帮他们吗