—Who is the baby in this photo?—It’s my sister’s son. The photo by her by e-mail ten days

问题补充：

—Who is the baby in this photo?

—It’s my sister’s son. The photo by her by e-mail ten days ago.

A. sends

B. is sent

C. sent

D. was sent

答案：

A. sends

B. is sent

C. sent

(答案→)D. was sent

解析：句意：照片中的婴儿是谁？——是我姐姐的儿子。这张照片是十天前她通过电子邮件送来的。结合语境可知本句描述的是过去的动作，故用一般过去时态。主语是动作对象，故用被动语态，选D。