单项选择题

______ seriously ill, you ought to go back to see her.

A. As your mother is
B. Your mother is
C. Being
D. Your mother being
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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
______ to understand what he doesn't, he makes a fool of himself.
A. Always pretending
B. Always pretended
C. Having always pretended
D. Always being pretended
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