Birdsandanimalseatinsects,butallofthemtogetherkillinsectsfarfewerthanspiders.A.havebeenputB.beingputC.putD.tobeput

Question

Birds and animals eat insects,but all of them________together kill insects far fewer than spiders.
A.have been put B.being put C.put D.to be put

Answer 1

B
句中已经有动词 kill 所以不用A,C
to be put表将来,不合语境
用B