We should try all means to ensure ourselves all possible risks.A. thatB. againstC. forD. t

问题补充：

We should try all means to ensure ourselves all possible risks.

A. that

B. against

C. for

D. to

答案：

A. that

(答案→)B. against

C. for

D. to

解析：考查介词：ensure sb against确保某人免受…,句意是：我们应该用各种方法确保我们免受各种可能的危险。选B。