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 most obvious and rapid change in the development of a language takes place in the area of ______.
A．pronunciation
B．vocabulary
C．grammar
D．speech
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