单项选择题

"Where can I find Jim" "He is ______ his work. He won't leave the lab until 6:00 p.m."

A. on
B. over
C. at
D. under
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单项选择题
Hellen Keller's ______ over deafness, blindness, and muteness was a miracle.
A. improvement
B. success
C. advance
D. triumph
单项选择题
If you ______ change your mind, please let us know.
A. shall
B. should
C. will
D. would
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