Living in the central American desert has its problems, ________ obtaining water is not the least .
| A．of which | B．for what | C．as | D．whose |
— Why are your hands that dirty?
— Oh, I______ in the garden since we finished breakfast.
| A．worked | B．was working |
| C．am working | D．have been working |
Yesterday I went to see him, _________ that he had gone abroad two days before.
| A．only to learn | B．to learn only |
| C．only learned | D．only learning |
Every year，a good many tourists are attracted to visit the old temple ________back to the eleventh century.
| A．dated | B．dating | C．to date | D．being dated |
________that we can’t get the necessary equipment，we will have to give up the experiment.
| A．To assume | B．Assumed | C．Assumes | D．Assuming |
Lucy was chosen for the job because she was superior ________the other candidates.
| A．at | B．for | C．to | D．In |