从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性：（）
A.A
B.B
C.C
D.D
参考答案：C
We _______ talk loudly when we see the sign “ Be quiet ”on the right.
A．must
B．mustn’t
C．need
D．needn’t
With many major economic problems_______ to be addressed, there is no point _______ the growth rate of this year now.
A．remaining ; predicting
B．remaining ; to predict
C．remained ; predicting
D．remained ; to predict
