单项选择题

—Isn't it hard to drive downtown to work
—Yes, that's why I ______ to work by train.

A．have been going
B．have been gone
C．has gone
D．going
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单项选择题
______in 1936, Harvard is one of the most famous universities in the United States.
A．Founding
B．It was founded
C．Founded
D．Being founded
单项选择题
Young ______ he is, he knows what is the right thing to do.
A．because
B．as
C．although
D．while
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