答案：C测试点：时态。分析：that从句的主语是our primiti

答案：C测试点：时态。分析：that从句的主语是our primitive ancestors (我们远古的祖先)，其谓语动词只能用过去时态，不能用现在时。此处have应为had。

Kết quả (Anh) 1:

Answer: c test: tenses. Analysis: that clause's subject is our primitive ancestors (our ancient ancestors), the predicate can only be in the past tense, not to use the present tense. Should have had here.

Kết quả (Anh) 2:

Answer: C test point: tenses. Analysis: that clause is the subject of our primitive ancestors (our ancient ancestors), it can only use the verb in the past tense, not the present tense. Here should have had.

Kết quả (Anh) 3:

Answer: C test point: tense. Analysis: the subject of the that clause is primitive ancestors our (our ancient ancestors), its predicate verb can only use the past tense, can not use the present time. Here have should be had.