单选题
You ______ get up and let that old lady have your seat. That's the decent thing to do, don't you think so?
A、
must
B、
have to
C、
should
D、
need
【正确答案】
C
【答案解析】
must必须，have to不得不，should应该，need需要。你应该站起来给这位老人让座儿。你不认为这是件道义上的事吗?
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