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 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,故B正确。
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