So difficult ____that no one could ___ a good solution to it.
| A．was the problem; come up with |
| B．the problem was; come up with |
| C．the problem was; put up with |
| D．was the problem; put up with |
—Were you caught in the rain yesterday?
—Good luck. No sooner home than it poured down.
| A．I had reached | B．had I reached | C．did I reach | D．I have reached |
----______was it ______ they discovered the entrance to the underground palace?
----Totally by chance.
| A．How, that | B．What, that | C．When, when | D．Where, that |
On the chairs , who had come to Dalian looking for jobs.
| A．three young men sat | B．sat three young men |
| C．did three young men sit | D．three young men sitting |
——Did you know any French before you arrived in Washington?
——Never ____ it, actually.
| A．had I learned | B．have I learned |
| C．I have learned | D．I had learned |
_______ such a good chance, he planned to learn more.
| A．Given | B．Being given | C．Having given | D．Giving |