It's such a difficult problem. All stude

题库2022-08-02  22

问题 It's such a difficult problem. All students listen carefully to make themselves ____.(  )A. understand B. understanding C. to understand D. understood

选项 A. understand
B. understanding
C. to understand
D. understood

答案 D

解析 make themselves understood意思是“使他们自己明白”。
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