问题补充:
单选题Henrycan’tattendtheparty_____atTom’shouseatpresentbecauseheispreparingthespeechattheparty_____atMarie’shousetomorrow.A.held; being heldB.to be held; to be heldC.to be held; heldD.being held; to be held
答案:
D解析由at present可知第一空应用being held(表示正在被进行的动作);由tomorrow可知第二空应用to be held(表示即将被进行的动作)。