____ sure to come to dinner tomorrow .A do B please C be D must `我知道选B可是为什么啊?

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____ sure to come to dinner tomorrow .
A do B please C be D must `
我知道选B可是为什么啊?

选B 是错误的选择.
应该是 C be
be sure 祈使句 是务必、千万、一定的意思,