单项选择题

When ______ the education systems of China and Britain, the professor gave no comment.

A．being asked to compare
B．asked him to compare
C．asking him to compare
D．asked to compare
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单项选择题
The conference was organized for all of the ______ in the state.
A．mathematic teachers
B．mathematics's teachers
C．mathematics' teachers
D．mathematics teachers
单项选择题
Melted iron is poured into the mixer much ______ tea is poured into a cup from a teapot.
A．in the same way as
B．in the same way
C．in the same way which
D．in the same like
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