若要想显示图案色块,应单击下图色板调板中的哪个按钮()
A.A
B.B
C.C
D.D
参考答案:D
When he the door, he found his keys were nowhere.
A.would open
B.opened
C.had opened
D.was to open
地球物理学家、天文学家、大陆漂移说的创始人是()。