It is 12pm,will you have lunch here?sorry,_____ I have many things to do.A I must notB I can notC I don'tD I needn't为什么不选B呢?

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It is 12pm,will you have lunch here?
sorry,_____ I have many things to do.
A I must not
B I can not
C I don't
D I needn't
为什么不选B呢?

A
must not有不允许的意思,句中因为我有很多事情要做所以不允许也不能我现在吃饭

B

C

b

I can not是客观因素引起的,而I must not 是主观因素。

b

B