单项选择题

He was praised for ______ such a contribution to the country.

A) make
B) to make
C) to making
D) having made
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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
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
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