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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单项选择题
If he ______ my advice, he could not have been so miserable.
A) listen to
B) had listened to
C) would have listened to
D) should listen to
单项选择题
These photographs will show you ______.
A) what does our village look like
B) how does our village look like
C) what our village looks like
D) how our village looks like
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