【正确答案】 C

【答案解析】解析：词汇题。本题考查近义词，我们可从这些近义词的惯用句型人手。be capable of+名词或动名词，如：He is capable of anything＼This machine is capable of beingimproved．be competent for+名词，如：She is competent for the work．be competent to do有法定权利做……，如：This court is not competent to hear your case．be able＼unable to do，如：He is unable to do the experiment．enable sb．to do＼enable+名词，如：His kind help enabled me to finish the work ahead of time．Their hard work enabled the passage of the bill in time.依惯用句型可知，选C。