单项选择题

Unfortunately, we lost our way, and had to make _______with our rather limited vocabulary of traffic signals. ( )

A．do
B．to do
C．doing
D．to be done
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单项选择题
Reading books is a neat way of coming up with new ideas because one_______create all the ideas by oneself. ( )
A．doesn’t have to
B．mustn’t
C．ought not to
D．shouldn’t
单项选择题
I have repeatedly recommended that our social security system _______cover many of the occupations. ( )
A．being extended
B．extended to
C．had extended to
D．be extended to
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