—What this in English?—It a book.A. is amB. is areC. are isD. is is

问题补充：

—What this in English?

—It a book.

A. is, am

B. is, are

C. are, is

D. is, is

答案：

A. is, am

B. is, are

C. are, is

(答案→)D. is, is

解析： 本题的主语是this或is都为单数第三人称，be动词都要用is，故本题选D。