You can only be sure of you have at present; you cannot be sure of something you might get in the future.
A. that; what
B. what; /
C. which; that
D. /; that
网友回答
A. that; what
(答案→)B. what; /
C. which; that
D. /; that
解析：第一空填what，用以引导宾语从句，用作介词of的宾语，其中的what在从句中用作动词have的宾语; 第二空填that，用以引导定语从句，修饰先行词something。