单项选择题

The hard, out surface of the tooth is called enamel（）.

A．outside
B．appearance
C．outer
D．hiding

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Had I run out of gas, I ought to have called the garage（）.

A．had
B．would have
C．would
D．should have
单项选择题
I knew nothing of the motives behind his recent move,and I don''t know either the person to put him up to the action（）.

A．nor did I know ... who
B．not did I know ... that
C．nor do I know ... that
D．either did I know ... who
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