单项选择题

Listen! Do you hear someone（）for help

A. calling
B. call
C. to call
D. called

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单项选择题

Being a parent is not always easy, and being the parent of a child with special needs often carries with（）extra stress.

A. it
B. them
C. one
D. him

单项选择题

（）twice, the postman refused to deliver our letters unless we chained our dog.

A. Being bitten
B. Bitten
C. Having bitten
D. To be bitten

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