--- Hey, what’s up? Water is everywhere. What can I do for you?
--- Oh, great. I how to operate this damn new machine.
A. just wondered
B. was just wondering
C. had just wondered
D. have just wondered
网友回答
A. just wondered
(答案→)B. was just wondering
C. had just wondered
D. have just wondered
解析：考察时态。根据题意，嘿，发生了什么事?到处是睡。我能为你做点什么？——哦，太棒了。我正在想怎么来操作这台可恶的新机器呢。可知下文叙述的是刚才正在发生的动作，故用过去进行时态，选B。