单项选择题

"The stove is still on."
"It ______ on. I had turned it off myself and I checked it twice."

A．can't be
B．mustn't be
C．couldn't have been
D．mustn't have been
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单项选择题
Houses in this city are twice ______ expensive ______ they are in other cities.
A．as ... as
B．more ... as
C．much ... as
D．as ... than
单项选择题
Neither Smith nor I ______ to be blamed for that.
A．is
B．are
C．am
D．be
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