Our monitor talks about Mars as if he a scientist.A. isB. wereC. be D. had been

问题补充：

Our monitor talks about Mars as if he a scientist.

A. is

B. were

C. be

D. had been

答案：

A. is

(答案→)B. were

C. be

D. had been

解析：本题的含义是我们的班长谈论火星好像他就是一名科学家，本题as if后跟的从句表示虚拟的一种状况，故be用were，故本题选C。