单项选择题

I walked down the corridor, my footsteps frighteningly ______ through the empty deserted building.

A．echoing
B．echoed
C．to echo
D．having echoed
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单项选择题
The course normally attracts 20 students per year, ______ up to haft will be from orient.
A．in which
B．for whom
C．with which
D．of whom
单项选择题
While a computer cannot replace an instructor, it can take over many tasks to lessen the usual burden of the instructor.
A．routine
B．serious
C．generalized
D．compulsory
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