The phrase "once in a blue moon" in last line refers to______.
A: all at once
B: once for a long time
C: once in a while
D: once and for all
A: all at once
B: once for a long time
C: once in a while
D: once and for all
举一反三
- 同时: all at once|all once|at all once|at once
- Our children do enjoy hanging out with us ______, especially when we treat them with respect and love. A: once and for all B: once in a while C: once and forever D: once upon a time
- They all tried to talk _______, but I couldn’t hear anything they said. A: all the same B: once again C: for once D: all at once
- All of the plants on farms have been developed from plants _______ wild. A: once they grew B: they grew once C: that once grew D: grew once
- Riddle: What is it that occurs once in a second, once in a month, once in a century, yet not at all in a year or a week?