书名：新多益阅读满分一本通
页数：200
题目：
2._________ receiving notice that the company's chief supplier is going
bankrupt, management has been attempting to find a replacement.
(A) While
(B) Because
(C) Since
(D) Although
疑问： 答案是C,我选B, since 在这里当连接词，译成"因为"，可是B 也是后面接子句
请问错哪呢?感恩
17. Yearly maintenance checkups, _______ performed by a registered Bandy
mechanic, will guarantee the continued reliability of all Bandy hybrid
automobiles.
(A) if
(B) with
(C) for
(D) how
疑问: 答案是A，解答是写因为分词构句，可是分词构句不是要去掉连接词吗?
25. Lunch will be served until 1:30 p.m. or _________ supplies last.
(A) until
(B) before
(C) while
(D) when
疑问: 答案是C, 不知后面的语意要如何判断选什么样的连接词，
这里的last 是当adj.仅剩的意思吗?
麻烦大家不吝解惑，感恩