Which conjunction correctly completes the sentence? The professor discussed ______ the theory could be applied in practice.
答案解析
核心考点：从句连词辨析。解题思路：动词「discussed」后接含有选择意味的宾语从句时，正式语境优先用「whether」。选项B正确。C项「if」多用于条件句，D项「how」改变原句语义。易错点：混淆whether与if在名词性从句中的使用场景。
正确答案：B