单项选择题

______ evidence that language-acquiring ability must be stimulated.

A．If being
B．It is
C．There is
D．There being
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问答题
Suddenly there appeared a young woman (dress) ______ in pink.
单项选择题
______ is often the case, one third of the workers have over-fulfilled the production plan.
A．What
B．This
C．That
D．As
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