The heating system has recently been _______ to make it more efficient.
A: modified
B: guided
C: removed D weeded
D: weeded
A: modified
B: guided
C: removed D weeded
D: weeded
举一反三
- The heating system has recently been repaired to make it more _________ (efficiency).
- Recently more and more attention has been _.
- The park, which （ ） the monument, has recently been enlarged because more and more city residents like to go there to relax. A: disposes B: closes C: encloses D: dispatches
- Having a suitable agenda ________ (prepare) will make the meeting more efficient.
- The old musical instrument . A: (a) has been in the family for a long time B: (b) was bought recently C: (c) was sold recently D: (d) was repaired recently