are之所以改成is 是因为这个句子的主语是expertise,expertise是不可数名词,所以后面跟be动词只能用is,不能用are.
开头的Expertise in gathering,organizing and presenting （data）是不能单独成句子的,因为这一部分只是整个句子的主语而已.
SAT语法题!Expertise in gathering, organizing; and presenting da
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