When Mary saw _____ piles of plastic in
问题:
When Mary saw _____ piles of plastic in the bin, _____ strong sense of responsibility made her stick to her recycling work.
A.不填;不填
B.不填; a
C.the ; a
D.the; the
When Mary saw _____ piles of plastic in the bin, _____ strong sense of responsibility made her stick to her recycling work.
A.不填;不填
B.不填; a
C.the ; a
D.the; the