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

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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

单项选择题

Compared to ______ in the office, Kate found it more exciting to work as a teacher.

A. work
B. having worked
C. working
D. be working

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