GWD2的一道逻辑。。。

小c考托福

Shipping Clerk:  The five specially ordered shipments sent outlast week were sent out on Thursday. Last week, all of the shipments that were sent out on Friday consistedentirely of building supplies, and the shipping department then closed for theweekend.  Four shipments were sent toTruax Construction last week, only three of which consisted of buildingsupplies.

If the shipping clerk’s statements aretrue, which of the following must also be true?

1. At least one of the shipments sent to Truax Construction last     week was specially ordered.[C1]
   

At least one of last week’s specially ordered shipments did not     consist of building supplies.[C2]

At least one of the shipments sent to Truax Construction was     not sent out on Thursday of last week.[C3]

At least one of the shipments that were sent out on Friday of     last week was sent to Truax Construction.[C4]

At least one of the shipments sent to Truax Construction last     week was sent out before Friday.[C5]




答案选E。。谁可以帮我整理下这道题的逻辑关系，以及怎么排除前四个的。多谢！

chenmy1991

週四送了五個S     週五送了若干個 B ， 多少不知道，但週五除了B沒送其他東西    。

T 收到了四個東西 只有3個是B  。說明這四個中至少有一個不是週五送的。