Do you know the difficulty he has what eco-travel means?A. understandB. understoodC. to un

发布时间：2020-08-16 14:25:16

Do you know the difficulty he has      what eco-travel means?
A. understand
B. understood
C. to understand
D. understanding

网友回答

A. understand
B. understood
C. to understand
(答案→)D. understanding
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