单项选择题

Students will continue to make the same mistakes ______ we teachers tell them why they shouldn't do so.

A．unless
B．when
C．if
D．because
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单项选择题
-- How about ______ dinner at Roast Duck Restaurant -- Wonderful.
A．to have
B．have
C．having
D．have had
单项选择题
Let's go and wash our hands because dinner will be ready right away. Here right away means ______.
A．at all
B．at least
C．just now
D．at once
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