单项选择题

The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.

A．when
B．learned to
C．called
D．the
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The building, (which) roof can (be seen) here, is (the) biggest supermarket (in) town.
A．which
B．be seen
C．the
D．in
单项选择题
(Having been) finished (his) breakfast, (he) went out (for) a walk.
A．Having been
B．his
C．he
D．for
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