The new staff didn’t know how to use the system _________ I explained it to him yesterday.
举一反三
- （）, I didn’t know how to use the machine. A: At beginning B: At first C: At start
- He was obviously in some kind of trouble, but I didn't know how I could help him .
- The new manager didn’t know how to take _______ of his company.
- James has just arrived, but I didn’t know he __ until yesterday.
- To ______ the truth, I really didn't know anything about yesterday's meeting.