The river behind our house was very dirty in the past 改句保持句意
The river behind our house was very dirty in the past 改句保持句意不变
将“The river behind our house was very dirty in the past ”
变为：
“The river behind our house _____ _____ be very dirty”,保持句意不变
每个空格里填一个单词.
将“The river behind our house was very dirty in the past ”
变为：
“The river behind our house _____ _____ be very dirty”,保持句意不变
每个空格里填一个单词.
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你能帮帮他们吗