-- Where is your father?
-- He _______ to Australia on business.
A:has been
B:has gone
C:went
D:will go
如图所示是教材中关于电磁联系的四幅图片,关于这四幅图片的说法中正确的是
Some children in Jiangxi, China, go to school ________.
如图,菱形ABCD中,AB=4,∠A=120°,点M、N、P分别为线段AB、AD、BD上的任意一点,则PM+PN的最小值为____