求助 新PREP的一道题

kenny1206

Comcorp Shipping Clerk:  Last week, no shipments of building supplies were sent out on Friday.  The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies.  Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

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

A. All of Comcorp’s shipments of building supplies last week were specially ordered.
B. None of Comcorp’s shipments sent on Friday of last week was sent to Truax Construction.
C. None of the shipments sent by Comcorp to Truax Construction last week was specially ordered.
D. None of Comcorp’s shipments sent on Thursday of last week was sent to Truax Construction.
E. All of Comcorp’s shipments of building supplies last week were sent out on Thursday.

请问为什么不选D，选C啊

naoyixue

文中只说了，5个special ordered shipments,且每一个都包含building supplies (建筑材料），是在周四发货的。但是是否周四发货的还有那些不是specially ordered的，我们不知道，因为没有说。 此外，文中还说了，有4个不包含 building supplies的货物发给T。那么这4个是不是有可能就是周四发的（因为有可能周四还发了那些不是specially ordered的货物，且不包含building supplies),所以D不能确定

，同时，说了，上周只有5个special shipments，且每一个都有building supplies,那么和原文的发给T额不包含building supplies的信息结合，推出发给T的不包含specially ( 因为只要special shipment=buildingsupplies），但是发给T的没有building supplies, 所以C对