you’ve known the importance of it you should try your best to do it.A. So thatB. Now that

问题补充：

you’ve known the importance of it, you should try your best to do it.

A. So that

B. Now that

C. Now then

D. After that

答案：

A. So that

(答案→)B. Now that

C. Now then

D. After that

解析：短语辨析. A.以便;所以 B. 既然;由于 C.那么 D. 在那之后.句意:既然你已知道了它的重要性,你应该尽最大努力去做.故悬念B