John'sscoreonthetestisthehighestintheclass;he____lastnight.
A、muststudyC
「句意」 約翰的考試分數全班最高;他昨天晚上一定學習了。
「難點」 表示對過去某一動作行為的猜測須要用must have done 這一句型結構。
_____,hecannowonlywatchitonTVathome.
Evenifhisletter（）tomorrow，it（）toolatetodoanything.
Thethreementriedmanytimestosneakacrosstheborderintotheneighboringcountry_____bythepoliceeachtime.
.IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyou_____abletowritelettersinEnglish.
Wecanhear（）fromthebackoftheroom.
