单项选择题

Most embedded clauses require an introductory word called a subordinator, such as "that, until, before, ______, "and so on.

A．so
B．if
C．for
D．but
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单项选择题
Lead(metal) and lead(dog's head) are spelt in the same way, but pronounced differently. This kind of sense relation is called ______.
A．polysemy
B．antonymy
C．homonymy
D．hyponymy
单项选择题
The first known settlers of Britain were ______.
A．the Jutes
B．the Celts
C．the Saxons
D．the Iberians
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