1. Xerox has relied on the credit facility _____  its credit ratings were cut to junk status just a year ago.

a. before    b. while    c. when    d. since



답은 D번. 우선 주어+동사 가 2개씩 있으므로 접속사가 들어와야 하겠구요

종속절의 시제를 보니 현재완료가 왔네요. 그러므로 since가 와야 겠지요



2. That must have seemed a great idea when the stock price ______ soaring.

a. has been    b. were    c. had been    d. was



a번 같은데요. 시제일치해야 되므로 둘다 현재 완료



3. The two items which all groups related as the most important were high-quality leadership and healthcare _____.

a. benefits    b. beneficial    c. beneficent    d. benefit



명사 and 명사로 병치구조가 되어야 겠네요. 그럼 A번의 benefits가 와야겠지요.



4. There are worrying signs that regulations are becoming more intrusive in _____ areas as financial services, water and electricity.

a. so    b. some    c. such     d. since



답은 C 같구요. As 뒤에 열거된 지역들 처럼 몇몇 지역들이란 뜻을 가진.

Such areas as~게 되야 할거 같아요