单项选择题

I ______ writing the paper as scheduled, but my mother's illness interfered. I hope you will excuse me.

A. am to have finished
B. was to have finished
C. was to finish
D. ought to finish
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单项选择题
My mother is a light sleeper and is usually very ______ to any sound even as inaudible as the humming of a mosquito.
A. acute
B. keen
C. alert
D. immune
单项选择题
The water-skier ______ over the water.
A. skimmed
B. floated
C. drifted
D. swam
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