问一个完全不明白什么意思的逻辑题 谢谢！

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

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

A.      At least one of the shipments sent to Truax Construction last week was specially ordered.

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

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

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

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

归纳题

上周四送出了五船特殊运送商品．上周五送出的船只全部运送的建筑材料．周末码头关闭．

上周有四趟船运货到Truax Construction，其中３趟船运送的为建筑材料

这就证明这三条是周五中运送出的，而另外一条是在这之前运送出去的，因为周末就关门了