单项选择题

There is no doubt ______ the company has made the right decision on the sales project.

A. why
B. that
C. whether
D. when

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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

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

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