题目

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：B 解析: 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。

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