17．My sister _________ play the piano，but she ____________ sing well．（　�。�
A．must； mustn'tB．can； can'tC．can't； can'tD．must； must

分析 我妹妹會彈鋼琴，但她唱不好．

解答 答案：B．
must，一定，必須；mustn't不可以；can，能，會；can't不能，不會．根據(jù)My sister _________ play the piano，可知這里表示一種能力，所以用can，but前后應(yīng)該是轉(zhuǎn)折關(guān)系，所以后面用否定形式，表示不能．故選B．

點(diǎn)評 本題考查了情態(tài)動詞的用法．解答時注意句意以及所給選項(xiàng)的意思并作出正確選擇．

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