单项选择题

In the days when coal was so (widely) used, (no one) realized how soon and how (complete) oil would replace (it).

A．widely
B．no one
C．complete
D．it
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单项选择题
The course would (have been offered) this term. But it (cancelled) because too few students (had registered) before registration (closed).
A．have been offered
B．cancelled
C．had registered
D．closed
单项选择题
The responsibility (of the manager) in (such a large) international enterprise is (far) greater than (his typist).
A．of the manager
B．such a large
C．far
D．his typist
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