The snowstorm ________ our difficulties.
| A．added to | B．added up | C．added up to | D．has added |
The boy ________ the father worked in the USA is Jack.
| A．whose | B．of whom | C．who | D．whom |
Is this the school _______ you worked last year?
| A．where | B．that | C．the one | D．which |
Is this school _____ you visited last year?
| A．where | B．that | C．the one | D．which |
The Great wall is the only one of the buildings on the earth_____ seen from the moon.
| A．which is | B．which are | C．that are | D．that is |
Is there anything ________ I can do for you?
| A．which | B．who | C．that | D．whom |