am/is/are+being+done这个结构中为什么要being+done?
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am/is/are+being+done这个结构中为什么要being+done?am/is/are+being+done这个结构中为什么要being+done?am/is/are+being+done
am/is/are+being+done这个结构中为什么要being+done?
am/is/are+being+done这个结构中为什么要being+done?
am/is/are+being+done这个结构中为什么要being+done?
am/is/are+being+done 是现在进行时的被动词语态.
The trees are being cut nowadays .
加油!不明白再问!