___ is known to the world, Mark Twain was a great American writer.-考呗网

单选题___ is known to the world, Mark Twain was a great American writer.

A．As
B．Once
C．That
D．It

as引导定语从句，“正如世界上的都知道的是”

1 John complained to the bookseller that there were several pages____in the dictionary.

A．lacking
B．losing
C．missing
D．dropping

2 Not until the game had begun ___ at the sports ground.

A．should he have arrived
B．would he have arrived
C．did he arrive
D．had he arrived

3 Moviegoers know that many special effects are created bycomputers. ___ they often don´tknow is that these scenes still require a lot of work.

A．That
B．Whom
C．What
D．How