问题
选择题
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
答案
答案：B
what引导宾语从句，作介词of的宾语，what在宾语从句中作have的宾语。something后接定语从句，可以省略that。