单项选择题

How strict tutors are with their pupils ______ a strong impact on the quality of their pupils' academic papers.

A．has
B．have
C．having
D．to have
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单项选择题
Our scientific findings cannot be regarded as ______. in such a short period of time.
A．to have been obtained
B．to be obtained
C．having been obtained
D．being obtained
单项选择题
The disappearance of her paper has never been
A．counted for
B．looked upon
C．accounted for
D．checked up
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