问题补充:
Judging from his face there was a confident smile, we knew that he didn’t lose heart.
A. in which
B. from which
C. by which
D. on which
答案:
A. in which
B. from which
C. by which
(答案→)D. on which
解析:句意:从他带着自信的笑容的脸上,我们知道他没有灰心。这里使用了定语从句,先行词是his face,定语从句中缺少的是on the face,所以用on which引导定语从句,选D。