问题

this something, still unseen, theygave the name radium

A:Watching
B:To be watching
C:If you watch
D:To have watched

正确答案是：

同类题型

Twenty percent of the water ______ from the underground(地下).

Must I do the work today? —No, you _______. You may do it tomorrow.

－Will you please tell her about the news－Sure, I’ll tell her about it as soon as she back.

_____do you like watching comedies Because they’re funny.

Would you please the children with snake