-Can you help me?-Yes．I will do ________ I can to help you．A.whateverB.no matter whatC.howeverD.no matter how
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A解析考查连接代词。这里的whatever＝everything(that)，句中whatever I can(do)是前面do的宾语从句，如果改用everything(that)，则everything是do的宾语，(that)I can(do)是定语从句。句中to help you是目的状语，修饰will do。no matter引导的从句只能作状语，不能作宾语，故B、D两项错误。