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FORTUNATELY, THE HOSPITAL'S NEW AIR-CONDITIONING S...
FORTUNATELY, THE HOSPITAL'S NEW AIR-CONDITIONING SYSTEM ______ WHEN THE FIRST HEAT WAVE OF THE SUMMER ARRIVED
Unit 1: HOME LIFE
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53.
Fortunately, the hospital's new air-conditioning system ______ when the first heat wave of the
summer arrived.
A. had installed B. had been installing C. had been installed D. installed
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53.
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Unit 1: HOME LIFE