___ you go across the road, you must be careful.
A: Since
B: After
C: When
D: Before
A: Since
B: After
C: When
D: Before
举一反三
- You must look carefully ______ you cross the road . A: before B: after C: and D: but
- When _______the street, you must be careful.
- Be careful when you _____ the road. A: cross B: walk C: across D: through
- It’s a long time . A: since I saw you last B: after I saw you last C: before I saw you last D: when I saw you last
- You are requested to complete the entry formalities at the arrival hall______ you have disembarked A: when B: after C: before D: since[单选题][2分][难度2]