单项选择题

Dr. Bethune began to work the ______ he arrived at the front.

A．moment
B．place
C．way
D．reason
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单项选择题
—This pen isn't yours, is it — ______.
A．Yes, it's not mine
B．No, yours is bigger
C．No, it's my friend's
D．Yes, mine's a red one
单项选择题
He insisted that his brother ______ the window. It was clear that someone else broke the window.
A．should not break
B．should not have broken
C．hadn't broken
D．would not break
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