prep 1-109

prep 1-109.

The discovery of glass being expandable and able to be shaped by human breath revolutionized
glassworking to such an extent that today"glassblowing"has become the generic term for all
glassworking,whether the glass is blown or formed by other techniques.

(D)that glass can be expanded and it is able to be
(E)that glass can be expanded and

KEY E

其实这题很难简单，但我还是把它做错了。选D的理由是：

我认为同位语从句并列that可以省略，就像并列的宾语从句中的that.这样it就指代glass了。是不是可以呢？

E为什么不说有歧义呢？原句说的是glass is expandable而且可以shaped by human breath,但是E说的是可以被expanded and shaped by human breath.不过这个理由也有点无聊，何必考你这个呢！