my two sisters. And my brother.A. This is this isB. These are this isC. These are the

问题补充：

my two sisters. And my brother.

A. This is, this is

B. These are, this is

C. These are, these are

D. This is, these are

答案：

A. This is, this is

(答案→)B. These are, this is

C. These are, these are

D. This is, these are

解析：通过上下文表语可以知道前面应为复数，后为单数。