19（）
A: When
B: Since
C: During
D: By
A: When
B: Since
C: During
D: By
举一反三
- They swim every day ______ the holidays. A: during B: when C: since
- The star has been playing basketball（）he was a boy. A: during B: when C: since D: as
- The star has been playing basketball ______ he was a boy. A: A) during B: B) when C: C) since D: D) as
- It was ( ) I was in American ( ) he wrote to me. A: when… that B: since…where C: when…since D: ecause…since
- When is the parameter file read during startup? A: When opening the Database B: When mounting the Database C: During the instance startup D: In every stage