Themissingboyswerelastseen________neartheriver.
A、playingA
所填的詞為主語補足語,因其后有明確的地點,補足語表示動作當時正在進行中,所以只能使用 playing 。
Pleasewriteareport________theabovesubjectsaretobecovered.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
Hefound_______difficulttostudymaths.
________inthought,healmostranintothecarinfrontofhim.
Asforfamilyeducation,parentsareencouragedtorelyon________ratherthanpunishment.