求这道题所包含的所有语法知识——turn color and fall to the ground is a sign of winter.A That leaves B When leaves C Leaves D If leaves

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求这道题所包含的所有语法知识——turn color and fall to the ground is a sign of winter.A That leaves B When leaves C Leaves D If leaves
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求这道题所包含的所有语法知识——turn color and fall to the ground is a sign of winter.A That leaves B When leaves C Leaves D If leaves
求这道题所包含的所有语法知识
——turn color and fall to the ground is a sign of winter.
A That leaves B When leaves C Leaves D If leaves

求这道题所包含的所有语法知识——turn color and fall to the ground is a sign of winter.A That leaves B When leaves C Leaves D If leaves
选B,when引导是时间状语从句
选D,if引导的是条件状语从句
选B或D句子意思都没错,所以只有选A