Swings moved gently（ ）in the breeze, as if rocked by some unseen hand.
A.sooner or later
B.back and forth
C.more or less
D.thick and thin
正确答案是B
Swings moved gently（ ）in the breeze, as if rocked by some unseen hand.
A.sooner or later
B.back and forth
C.more or less
D.thick and thin
正确答案是B