The woman there under the tree in a blue shirt is our headmaster.A. sitting; wearingB.

问题补充：

The woman there under the tree, in a blue shirt, is our headmaster.

A. sitting; wearing

B. sitting; dressed

C. seating; dressed

D. seated; dressing

答案：

A. sitting; wearing

(答案→)B. sitting; dressed

C. seating; dressed

D. seated; dressing

解析：句意：坐在树下的穿蓝色衬衫的女士是我们的校长。这里两个空都需要非谓语做定语，the woman和sit是主动关系，用sitting，而如果用seat“使..就坐”，应该是过去分词seated做定语，第二空填dressed，因为“穿着”是be dressed in，所以选B。