Question

MacDonald who had spent much of his time     graduating from college backpacking round Europe,decided last year to settle down.

A．when

B．while

C．since

D．before

Answer 1

C

句意为“自大学毕业回来之后。MacDonald一直花费了他的大部分时间徒步环游欧洲，到去年才决定安下身来”。since表“自从……以来”之意。