When receiving reports, counter staff should ensure that record, retain and reveal all material and pass it to the investigating officer.
Atheir
Bthose
Cthey正確答案
Dthese
答案與詳解
為什麼答案是 C
that 引導的名詞子句需要自己的主詞，they 回指 counter staff，後接動詞 record, retain and reveal，文法與語意皆通順。
考點：所有格誤用考點：指示代名詞考點：主格代名詞
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