The boy burst into tears ______ he saw his mother.A direct B.direction C.directly D.directly when

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The boy burst into tears ______ he saw his mother.
A direct B.direction C.directly D.directly when

D
这里修饰需要一个状语,只能用副词,所以用directly
后面一句是从句,时间状语从句,所以要用when