对括号部分提问:(格式在下)原句:They flown to Shanghai (once a month)格式: ______ _______ _________( 3格空格 ) they fly to Shanghai.

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对括号部分提问:(格式在下)原句:They flown to Shanghai (once a month)格式: ______ _______ _________( 3格空格 ) they fly to Shanghai.
对括号部分提问:(格式在下)原句:They flown to Shanghai (once a month)
格式: ______ _______ _________( 3格空格 ) they fly to Shanghai.

对括号部分提问:(格式在下)原句:They flown to Shanghai (once a month)格式: ______ _______ _________( 3格空格 ) they fly to Shanghai.
How often did
就是问频率的意思