______by guards with guns,they raised their legs in unison and made their way to the edge

Question

______by guards with guns，they raised their legs in unison and made their way to the edge of the highway，Interstate 65.

A. Watching over

B. Watch on

C. Watched over

D. Be watched over

Answer 1

正确答案：C
[解析] 65号州际公路被持抢的警卫们守卫着，他们迈着整齐的步调走在高速路边。用被动语态，故选C。