单项选择题

Until then, his family ______ from him for six months.

A．didn't hear
B．hasn't been hearing
C．hasn't heard
D．hadn't heard
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单项选择题
When first ______ to the market, the toys didn't attract much attention.
A．introducing
B．introduced
C．was introduced
D．being introduced
单项选择题
-- Did the policeman let you in-- No, ______ I told him who I was.
A．if
B．once
C．as though
D．even though
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