Ken is good at playing _/_drums,but Selina slways plays_/_guzheng well. "as" is right. If you use "since",the following sentence must use present pefect tense(现在完成时态). as 在这里表达的是一个逐渐变化的过程.
Ken is good at playing _/_drums,but Selina slways plays_/_guzheng well. \"as\" is right. If you use \"since\",the following sentence must use present pefect tense(现在完成时态). as 在这里表达的是一个逐渐变化的过程.
