If unsolved, the problem of food safety may lead to more serious results.
| A．having left | B．to leave | C．left | D．leaving |
She showed the visitors around the museum，the construction ________ had taken more than three years.(2011·江西)
| A．for which | B．with which |
| C．of which | D．to which |
Julie was good at German，French and Russian，all of ________ she spoke fluently.(2011·湖南)
| A．who | B．whom | C．which | D．that |
Care of the soul is a gradual process ________ even the small details of life should be considered.(2012·湖南)
| A．what | B．in what | C．which | D．in which |
The man showed us such a heavy stone ________ no one could lift it.
| A．that | B．as | C．which | D．and |
The number of the audience，________ we had expected，was well over one thousand.
| A．whom | B．who | C．which | D．as |