19．-David，turn off your computer now!You                    play on it too long．
-I see，mum．（　�。�
A．couldn'tB．mustn'tC．wouldn't

分析 --戴維，現(xiàn)在關掉你的電腦！你不可以玩太久．
--我知道了，媽媽．

解答 答案：B．
根據(jù)David，turn off your computer now!You                    play on it too long．可知戴維，現(xiàn)在關掉你的電腦！你不可以玩太久，這里表示禁止做某事，應該用mustn't．故選B．

點評 本題考查了情態(tài)動詞的用法．解答時注意了解句意以及所給選項的意思并作出正確選擇．

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