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
Although ______ in a religious family, he did not believe in God at all.
A．grown
B．cultivated
C．raised
D．bred
单项选择题
It was unimaginable that they should have travelled across such an ______ area to look for a lost lamb.
A．extensive
B．expensive
C．expansive
D．intensive
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