单选题
Itisimperativethatstudents_____theirtermpapersontime.
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A
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Itisimperativethatstudents_____theirtermpapersontime.
_____ifIhadarrivedyesterdaywithoutlettingyouknowbeforehand.
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_____forthefactthatshebrokeherleg,shemighthavepassedtheexam.
Allofuswouldhaveenjoyedthepartymuchmoreifthere_____quitesuchacrowdofpeoplethere.
.IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyou_____abletowritelettersinEnglish.