If only I could make the trip with you ! But I stay home and take care of my sick mother.A

问题补充：

If only I could make the trip with you ! But I stay home and take care of my sick mother.

A. could

B. was going to

C. may

D. have to

答案：

A. could

B. was going to

C. may

(答案→)D. have to

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