读取欧元兑美元、港元兑美元、人民币兑美元汇率，数据来自 oanda

library(quantmod)
getSymbols(c("EUR=x","HKD=x","CNY=X"),from"2018-01-01",to"2018-02-01",
           src="oanda")
xx2521<-cbind('CNY=X','EUR=X','HKD=X')
View(xx2511)

错误: unexpected string constant in "getSymbols(c("EUR=x","HKD=x","CNY=X"),from"2018-01-01""
>            src="oanda")
错误: 意外的')' in "           src="oanda")"

请求解答，试了好多都是报这个