单项选择题

Hydrogen is the fundamental element of the universe（）it provides the building blocks from which the other elements are produced.

A．so that
B．but that
C．in that
D．provided that

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单项选择题
The children won' t go there to watch the iron tower（）

A．to erect
B．to be erected
C．erecting
D．being erected
单项选择题
The movie was very boring and many people began to leave early. By the end, most people（）

A．had already left
B．were already leaving
C．were already left
D．had already been leaving
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