问题
选择题
Sam ______ coins since he was eleven years old, and now he has hundreds of them.
A．collected
B．had collected
C．has been collecting
D．had been collecting
答案
答案：C
考查时态。句意“萨姆自从11岁就开始收集硬币了，现在他有几百个了。”表示动作发生在过去，一直持续到现在，有可能继续持续下去。用现在完成进行时。故选C。
