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
You ______.yesterday if you were really serious about your work.
A．ought to have come
B．ought have come
C．would come
D．ought to be coming
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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