游客
题文

A recent research shows that there _____ volcanic activities on the moon and Mars. However, they no longer exist now.

A.had been B.has been C.were D.would be
科目 英语   题型 单选题   难度 较难
知识点: 动词语态
登录免费查看答案和解析
相关试题

—Hello!I want to book a double room.
—Sorry.There is no double room ________.

A.suitable B.available
C.comfortable D.cheap

The young man comes from a(n) ________ family,who owns several companies in London and Paris.                   

A.energetic B.intelligent C.anxious D.wealthy

—What was it that caused the party to be put off?
—________ the invitations.

A.Because Tom delayed sending
B.Tom delayed to send
C.That Tom delayed sending
D.Tom delayed sending

The new technology,if ________ to farming,will help increase the grain output.

A.applying B.to apply
C.applied D.having applied

________ this way can we smooth the difficulty we are faced with now.

A.Just in B.After in C.Just by D.Only in

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号