I HAVE _________.A.THREE BOX OF PEN .B.THREE BOX OF PENS .C.THREE BOXES OF PEN .D.THREE BOXES OF PENS.
问题描述:
I HAVE _________.
A.THREE BOX OF PEN .
B.THREE BOX OF PENS .
C.THREE BOXES OF PEN .
D.THREE BOXES OF PENS.
答