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

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
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