单项选择题

"What has happened"
"The window ______ but I haven't found out who ______ it."

A．broke; did
B．is broken; has broken
C．is broken; did
D．has been broken; has broken
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单项选择题
One learns a language be making mistakes and ______ them.
A．correct
B．correcting
C．corrects
D．to correct
单项选择题
We're going to the bookstore in John's car. You can come with us ______ you can meet us there later.
A．but
B．and
C．or
D．them
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