Sally has been waiting half an hour for Peter, so C has been circled.

Sally等了Peter半小时，所以应该圈C。

So C is the most correct answer.

所以C是最正确的答案。

And so, c and d are analogs: they both take motions as arguments.

因此，c 和 d 是类似的：它们都以动议作为参数。