自考《英语（二）》试题练习：填句补文（11.7）
单选题
[填句补文] Although the researchers have only just made the technical details of the microscope public， it is already on sale. It is currently the size of a refrigerator and takes several minutes to scan a circuit， but Xiao and Schrag are working ________.
A、to take tiny chips we require
B、to making chips any smaller
C、to shrink it to the size of a desktop computer and cut the scanning time to 30 seconds
D、of conducting electricity
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