单项选择题

Many local people were deeply concerned about the nuclear leakage, ______ was still kept secret.

A．the cause of that
B．and the cause of which
C．the cause of which
D．which cause
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单项选择题
After the devastating earthquake, the ______ army was immediately called in to evacuate the weak and injured.
A．regular
B．normal
C．formal
D．conventional
单项选择题
Please write your name in the ______ space at the top of the page.
A．empty
B．vacant
C．blank
D．free
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