There was a _______look on his face when he met with the______problem.
| A．confusing；confusing | B．confused；confused |
| C．confusing；confused | D．confused；confusing |
_____ is no possibility that Bob can win the first prize in the match.
| A．There | B．It | C．That | D．This |
—Have you ever ridden a horse ?
—No, but I _____ a camel when I visited Egypt last year.
| A．was riding | B．have ridden | C．rode | D．had ridden |
—I must apologize for ________ ahead of time.
—that’s all right.
| A．letting you not know | B．not letting you know |
| C．letting you know not | D．letting not you know |
________ I understand you，I still can’t support you.
| A．When | B．After | C．While | D．As |
____ to the Qin Dynasty，the traditional crosstalk shows have made people roar with laughter.
| A．Dating back | B．Dating from | C．Dated from | D．Dated back |