\_\_\_\_ over a million different species of insects exist in the world, more than all other animal species combined.
AIt is estimated that正確答案
BThere is estimate
CThat is estimated
DThe estimate is
答案與詳解
為什麼答案是 A
It 為虛主詞，is estimated 為被動語態，that 引導名詞子句作為真正的主詞，語法與語意皆完全正確。
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