Maria has to baby-sit. That’s she can't come with us.A. whyB. hoC. whenD. what

问题补充：

Maria has to baby-sit. That’s she can come with us.

A. why

B. ho

C. when

D. what

答案：

(答案→)A. why

B. ho

C. when

D. what

解析：可联系答.案.网客服索取。