Most embedded clauses require an introductory word called a subordinator, such a

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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

解析此题要求找到从属连词，在所给选项中很显然是if。或者通过排除法，看到so，for和but都是并列连词，也只剩下if，因而正确答案为B。

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