We'll have to work the clock if we want to complete the work on time.A. beyondB. overC. ag

问题补充：

Well have to work the clock if we want to complete the work on time.

A. beyond

B. over

C. against

D. from

答案：

A. beyond

B. over

(答案→)C. against

D. from

解析：本题考查介词。“为了按时完工我們將要不分昼夜地工作。”against the clock争分夺秒地。