单项选择题

The reason why John left his home was ______ he felt he'd brought shame to his parents.

A．because
B．that
C．as
D．for
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单项选择题
A knock at the door again! It was the third time someone ______ me that evening.
A．has interrupted
B．had interrupted
C．to have interrupted
D．would have interrupted
单项选择题
This is so difficult a problem that the scientist is known to ______ on it for about ten years, but hasn't found an answer yet.
A．have worked
B．have been working
C．be working
D．work on
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