<p dir="ltr" style="text-align: justify;"><span><span style="">This question aims to test a fixed English sentence pattern that is used to say that someone insists that someone else do something. Not only does the verb “insist” fits this sentence pattern, but a number of other verbs that express similar meanings also apply. </span></span></p><div dir="ltr" style="" align="left"><table class="classic-table"><colgroup><col></colgroup><tbody><tr style=""><td><p dir="ltr" style=""><span><span style="">S + </span><span style="text-decoration-line: underline; text-decoration-skip-ink: none;">command/ order/ require/ request/ ask/ demand/ command/ purpose/ advise/ propose/ insist</span><span style=""> that + S + (should) + the basic form of a verb</span></span></p></td></tr></tbody></table></div><p><br><span><span style="">What’s special about this sentence pattern is that the verb in the that-clause is a basic form with a helping verb “should” that precedes it omitted. Therefore, the correct answer is choice (A) </span><span style="">stay</span><span style=""> instead of the other choices that use the verb “stay” in different tenses. </span></span></p>