单项选择题

George entered the box and picked up one of the directories inside, ______ that someone unknown had torn out the very page he needed

A．only to discover
B．discovered
C．to discover
D．only discovering
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单项选择题
In architecture (建筑学), a vault (拱顶) is a proof or ceiling in the ______ of an arch.
A．form
B．figure
C．shape
D．appearance
单项选择题
A friend of mine returned to his house after a holiday only to find it ______ broken into.
A．be
B．was
C．had
D．had been
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