46. It isn't due until Thursday morning.

点睛

本句的难点在于对due的理解，它最常见的短语due to，意为“因为”，但是本句中due的意思为“到期，截止”。事实上，due的含义十分丰富：
“欠债的”。如：
The amount still due is 5,000 pounds. 仍欠付的款额是5000英镑。
“适当的”。如：
We should pay him with all due respect. 我们应该给他适当的尊重。
“充分的”。如：
We have due cause to honor them. 我们有充分的理由给予他们荣誉。
“预计的”。如：
Their train is due in 15 minutes. 他们的火车预计在15分钟后到达。
“被期望的”。如：
He finally got a long due promotion. 他终于得到了盼望已久的晋升。