By the time he realizes he________into a trap, it'll be too late for him to do anything about it.[ ]

A. walks      

B. walked

C. has walked  

D. had walked

斋功是指信徒于每年斋月即_____时，每天从黎明到日落要戒饮食，待日落后才能进清淡食物。

A．回历6月

B．回历7月

C．回历8月

D．回历9月