欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

The split between humans and apes is believed by scientists______15 to 20 million years ago.
A．to be occurringB．having occurredC．to have occurredD．to occur
C

試題分析：句意：科學(xué)家們認(rèn)為人類和猿類的分化發(fā)生在1500百萬到2000百萬年前。不定式的動作的發(fā)生要早于謂語動詞動作的發(fā)生，因此用不定式的完成式，選C。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：單選題

After completing and singing it, please return the form to us in the envelope _________.
A．providedB．providingC．having providedD．provide

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

The newly-discovered evidence led to the criminal ____ to five years in prison.
A．to be sentencedB．being sentencedC．sentencedD．be sentenced

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

________ at the golden belt of Yangtze River Delta, Ma'anshan is the National Garden city _______ wonderful landscape appeals to many visitors every year.
A．Located; whichB．Locating; whichC．Located; whoseD．Locating; whose

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

The little boy fell asleep while ______TV. So his mother sent him to bed at once.
A．watchedB．to watchC．was watchingD．watching

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

_____ by the latest electronic toys, the little boy stood in front of the windows, without moving.
A．To be arrestedB．ArrestedC．Having arrestedD．Arresting

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

_____ at the back of the theatre, the girl couldn’t see ZhouJielun clearly.
A．SeatingB．SitedC．SeatedD．Seats

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

____ in her most beautiful skirt, the girl tried to make herself ____ at the party.
A．Dressed; noticedB．Dressing; noticed
C．Dressed; noticingD．Dressing; noticing

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

______ on his past mistakes, Ted realized that he had stayed around the wrong people.
A．To reflectB．ReflectingC．ReflectedD．Being reflected

查看答案和解析>>

同步練習(xí)冊答案