The workers _____busily when the boss came to look for something she ______in th
题型：不详难度：来源：
The workers _____busily when the boss came to look for something she ______in the office.
A had worked, had left B were working ; had left C working ; had left D had worked; left |
答案
| B |
解析
| 前一空表示当时正在进行的动作，所以用过去进行时，第二空用过去进行时表示这动作在came之前。 |
举一反三
The box _____. Better call in a mechanic(修理工).
A isn’t open B hasn’t been open C isn’t be open D won’t open |
The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered |
| The notice ______ “No smoking”. A is told B reads C tells D is read |
-- Look! Everything here is under construction.
--- What’s the pretty small house that ______ for?| A．is being built | B．has been built | | C．is built | D．is building |
|
I first met Mr. Smith in America. He ______ at Stanford University then.| A．studied | B．has studied | | C．is studying | D．was studying |
|
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