28. They ____ friends since they met in Shanghai ten years ago.
| A．have become | B．have turned | C．have been | D．have grown |
I failed in the examination last term and only then ____ the importance of studies.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
Only when your identity has been checked ,.
| A．you are allowed in | B．you will be allowed in |
| C．will you allow in | D．will you be allowed in |
The old couple married for 40 years and never once____ with each other.
| A．they had quarreled. | B．they have quarreled |
| C．have they quarreled | D．had they quarreled. |
—How was the 2008 Beijing Olympic opening ceremony?
—________ that the whole world was attracted.
| A．It was very fantastic | B．Such fantastic was it |
| C．So fantastic was it | D．So fantastic it was |
海南三亚一中月考3，24）So difficult _______it to work out the problem that I decided to ask Tom for some advice.
| A．I did find | B．did I find | C．I’ve found | D．have I found |