单项选择题

Frequently single-parent children()some of the functions that the absent adult in the house would have served.

A. take off
B. take after
C. take in
D. take on

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单项选择题
The theory is of great importance () the hotter a body is, the more energy it radiates.

A. that
B. when
C. which
D. what
单项选择题
It is highly desirable that a new president () for this college.

A. is appointed
B. will be appointed
C. be appointed
D. has been appointed
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