關于一道英語題中逗號的問題
After the meeting＿＿＿＿＿＿＿＿＿the different teams tried to construct a bridge over the river.
A ,and following the instructions we’d been given
B ,and following the instructions we’d been given,
C and following the instructions we’d been given,
D and following the instructions we’d been given
正確答案選b,但是為什么啊?
是插入語我懂了，可是如果選c，即After the meeting and following the instructions we’d been given，
the different teams tried to construct a bridge over the river。有什么錯誤??？