The leave on the trees ____ yellow in autumn.A are turningB are turnedC turning选择并说明理由.
问题描述：
The leave on the trees ____ yellow in autumn.
A are turning
B are turned
C turning
选择并说明理由.
答
a
答
A
用的是现在进行时.
B是错误的,因为are 后面应加动词的ing,而不是过去式
C更是错,turning只有在like（或还有其他的）动词后面才可加ing,或者加上be动词