单项选择题

The door opened and in ______.

A．came a group of journalists
B．did a group of journalists
C．come a group of journalists
D．did come a group of journalists

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单项选择题

They repeated the experiment several times ______ they were sure that the result was reliable.

A．until
B．for
C．since
D．when

单项选择题

Yesterday when I was walking on the street, I ______ to see an old friend of mine.

A．managed
B．happened
C．settled
D．occurred

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