so that ..句型不好 they rarely hold。。。they指代
[指代的单复数!] they rarely hold 指代 mutual fund, 应为单数,所以错!
they指代错误
they?
错误理解了主语,主语是 a mutual fund而不是 companies 所以有 they的选项都错, 应是做伴随状语修饰a mutual fund 共同基金
they 没有指代对象。
they 和单数 a mutual fund不对应。
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