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It is during his spare time _______ John has been studying a course in French.
A、when
B、that
C、which
D、what
【正确答案】：B
【题目解析】：此题考查强调句型。读懂全句，注意其中的“It is+名词或短语+that”的强调句型。强调人时，结构中的that可由who替代，that可用于其他各种情况，不能使用which、when、 what等词，选B为答案。