Some children were seen playing here in the garden all morning．It must have been ________ who picked
Some children were seen playing here in the garden all morning．It must have been ________ who picked the flowers．
A.they
B.them
C.he
D.him
答案及解析： A
Some children were seen playing here in the garden all morning．It must have been ________ who picked the flowers．
A.they
B.them
C.he
D.him
答案及解析： A