题干
Henry can’t attend the party _______ at Tom’s house at present because he is preparing the speech at the party _______ at Marie’s house tomorrow.
A：held; being held
B：to be held; to be held
C：to be held; held
D：being held; to be held
答案(点此获取答案解析）
D
MgxMo3S4 ；在镁原电池放电时，下列说法错误的是（ ）
