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

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

选项 A、so
B、if
C、for
D、but

答案B

解析 本题考查句法知识。大多数子句都有个引导词,这个词叫做从属连词,如that,until,before,if等。
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