帮我做做这几道题1All that can be done ____done. A. has B. have C. ha

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帮我做做这几道题
1All that can be done ____done.
A. has B. have C. has been D. have been
2 Mary's teacher and friend ____ a woman singer.
A. is B. are C. be D. has
3 John as well as his parents ____ fond of music.
A. are B. is C. has D. have
4 The headmaster as well as all the teachers ____ very kind to us.
A. is B. are C. look D. seem
5 Plastics ____ many other materials.
A. has taken place of B. has taken the place of
C. have taken place of D. have taken the place of
顺便说一下思路谢谢

C.虽然主语是all,但这个是特殊用法,我做过原题的,没错,是单数
A.从后面a woman singer看出是一个人
B.as well as 是就近原则
A.同第三题
B.plastics虽然加了s,但它是不可数名词,所以用单数形式,take the place ofxxx,代替了xxx的位置

all that can be done has been done 为什么要用has,不用have All that can be done __been done.请问该用has还是 have? all that can be done has been done Has all that can be done been done? all that can be done has been done. 主谓一致：（并说明原因）All that can be done___.A.has been done B.has do You can play when your work__ A.Will be done B.is done C.has All__can be done has been done.A.that B.who C.wh all that can be done been done. all that can be done has been done.中的that为 All that can be eaten _______ eaten up. A are being B has be 一个题英语语法All that can be eaten_____eaten up.A.have beenB.has