单项选择题

A new technique ________, the gross output increased by 20 percent.

A．working out
B．having worked out
C． having been worked out
D．to have been worked out
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单项选择题
Which of the following statements is NOT true
A．His ears were ringing.
B．He was short of breath.
C．He felt cold.
D．His eyes seemed to be bulging out.
单项选择题
Why is Laura at the bicycle shop
A．She’s waiting for her father.
B． She’s having her bicycle repaired.
C．She works there.
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