It was only after I came across that matter_______ how important it was to master a foreign language.
| A．did I realize | B．had I realized |
| C．that I realized | D．when I realized |
Is this the factory ___ you visited last year?
| A．the one | B．where | C．that | D．which |
__ was once regarded as impossible has come true.
| A．Who | B．Which | C．That | D．What |
I have no idea ___.
| A．that she has come | B．what she has come | C．that she comes | D．what she came |
The reason______ he gave for being absent from school was ______ he had to attend his sick mother at home.
| A．which; because | B．why; because | C．不填; that | D．why; that |
Little Tom hid himself in the place_______ couldn’t be found, _______make her mother annoyed.
| A．that; that | B．that; which | C．where; which | D．which; what |