The technician (working/worked) night and day to get the security system running.
에서 답이 왜 worked 인지.
The freshness of the vegetables at the market (vary/varies) depending on the time of year.
에서 답이 왜 varies 인지.
When Joseph completes the audit, he concluded that it needed to be revised.
여기서 completes->completed 되는지.
해설에도 연습문제는 설명이 없더라구요 ㅠ.ㅠ...
너무 기초도 없는 질문있일수도 있지만 답변 부탁드립니다.!!
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