Whether by accident or ______, he arrived too late to help us.

单项选择题Thank you for sending us () fresh vegetables of many kinds. You have done us () great service.

A. / a
B. the a
C. / /
D. the /

单项选择题If Newton lived today, he would be surprise by what () in science and technology.

A. had discovered
B. had been discovered
C. has discovered
D. has been discovered

单项选择题Which of the following statement is INCORRECT

单项选择题I prefer () there doing nothing.

A. working than sitting
B. to work than to sit
C. working to sit
D. to work rather than sit

单项选择题终身教育思想形成于20世纪60年代的欧洲，由( )首先提出。