单项选择题

To their credit, the Department of Energy ______ these ideas and funded a detailed study.

A. took over
B. took on
C. took up
D. took to
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单项选择题
The disappearance of her paper has never been ______.
A. counted for
B. looked up
C. accounted for
D. checked up
单项选择题
—I'm sorry that John is out. —Please ask him to call me as soon as he ______.
A. returned
B. returns
C. will return
D. has returned
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