英语单选1. (1) Mr. Smith did all he could ______ his family’s li

1.(1) Mr.Smith did all he could __B____ his family’s living standard.
(2) Mr.Wang made up his mind to devote all he could __D_____ his oral English before going abroad.
(3) He couldn’t believe that such a little boy could __A___ his English with so little time.
A.improve B.to improve
C.improving D.to improving
1.all he could理解成“他所能做到的事”,是“sth”,所以整句就是：do sth to do(表目的)
2.devote sth to doing [to作介词]
3.情态动词could后接“动词原形”
-------高三英语教师在线

to improve
to improve
improve