单项选择题

With all the data he needed ______, Peter began to write his thesis.

A．collecting
B．being collected
C．to be collected
D．collected
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单项选择题
Although the model looks good on the surface, it will not bear close ______.
A．disposition
B．contamination
C．scrutiny
D．symmetry
单项选择题
A．apprehendB．comprehendC．understandD．grasp
A．apprehend
B．comprehend
C．understand
D．grasp
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