单项选择题

All ______ live must die.

A．which
B．who
C．that
D．whom
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单项选择题
It is amazing that the habit Sam developed in his childhood still ______ him.
A．adds to
B．attends to
C．clings to
D．takes to
单项选择题
It is essential that all the details in this case ______ first.
A．is investigated
B．was investigated
C．be investigated
D．shall be investigated
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