问题
单项选择题
Sam ()Chinese since he came to Chin
A. learns
B. learned
C. has learned
D. will learn
答案
参考答案:C
解析:
根据句中since引导的时间状语从句可知,主句应使用现在完成时,故选C。
Sam ()Chinese since he came to Chin
A. learns
B. learned
C. has learned
D. will learn
参考答案:C
解析:
根据句中since引导的时间状语从句可知,主句应使用现在完成时,故选C。