3 They stood on the top of the mountain,____ .3 They stood on the top of the mountain,____ the sun ___ in the east.a.watched...rise b.watching ...rising 选哪个,
问题描述：
3 They stood on the top of the mountain,____ .
3 They stood on the top of the mountain,____ the sun ___ in the east.
a.watched...rise b.watching ...rising 选哪个,
答