Question

Hey,John!Would you like to come to my birthday party this afternoon?___I have to look my sister

A I'd love to B I'afraid Ican't C Sorry ,I won't

Answer 1

选择B

意思是：恐怕我去不了，我要照顾我妹妹。

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Answer 2

选B。
选A的话要接but来转折表示不能去的原因。
C的话，一般这种拒绝不用wont，都是cant。

Answer 3

B I'afraid Ican't