句型转换the students stood there and didn't know what they shoul
句型转换
the students stood there and didn't know what they should do.
the students stood there and didn't know（ ）
（）里只能填3个词以内
the students stood there and didn't know what they should do.
the students stood there and didn't know（ ）
（）里只能填3个词以内
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你能帮帮他们吗