单项选择题

I would have gone to visit him in the hospital had it been at all possible, but I （）fully occupied the whole of last week.

A．were
B．had been
C．have been
D．was

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单项选择题
The vocabulary and grammatical differences between British and American English are so trivial and few as hardly ____________ .
A．noticed
B．to be noticed
C．being noticed
D．to notice
单项选择题
In this way these insects show an efficient use of their (sound-produced) ability, (organizing) two sounds (delivered) at a high rate as one (call).
A．sound-produced
B．organizing
C．delivered
D．call
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