--I would why he so strangely these days.
--Recent pressure at study may account for his behavior.
A. was acting
B. is acting
C. acted
D. acts
网友回答
A. was acting
(答案→)B. is acting
C. acted
D. acts
解析：考查时态。these days是与现在有关的时态，这几天他的情况，用is acting, 句意：——我想知道为什么这些天他表现地这么异常？——最近的工作压力可以说明他的行为的原因。