4. Let me know ____ you need anything else.
A: although
B: what
C: when
D: if
A: although
B: what
C: when
D: if
举一反三
- When you are home , give a call to let me know you ______ safely.
- If anything ___（happen）to him , let me know .
- Please let me know ____________ when do you decide to come for a visit.
- No matter ____ you know, do not tell anyone else. A: what B: how C: when D: where
- If anything should happen()her, let me know at once. A: to B: on C: in D: with