Question

改错。下面句中有一处错误，把错误的一项选出来并加以改正。

When	I looked up,	I	saw	my teacher	to smile	to me.
	A		B		C

Answer 1

答案：C
解析：

to smile→smiling

提示：

“看见某人正干某事”应用see sb doing sth短语表示。