— How much are the two pairs of trousers?
— They are not expensive. I think one hundred dollars enough.
A. is
B. are
C. were
D. was
网友回答
(答案→)A. is
B. are
C. were
D. was
解析：句意：这两条裤子多少钱？——他们不贵。我认为100美元就足够了。结合语境可知下文描述的是客观性动作，故用一般现在时态，主语one hundred dollars表示抽象含义，故谓语动词用单数。