— 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
Not until all the fish died in the river ________ how serious the pollution was.
A．did the villagers realize
B．the villagers realized
C．the villagers did realize
D．didn't the villagers realize
