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
(Even though) she looks very (young), she is (twice older than) my (twenty-year-old) sister.
A．Even though
B．young
C．twice older than
D．twenty-year-old
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．registered
D．closed
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