In addition to this, even if another expression of time appears in other sentences, only one sentence (i.e., s 1 ) appears to be related to the question; thus, the system can easily determine the correct answer by attention, that is, by matching the words appearing both in the context and the ques-tion.
this kind of question does not require a complex understanding of language-e.g., multiple-sentence reasoning, which is known as a more challenging task (Richardson et al., 2013).