Itis_____thatthereportbesubmittedtotheHeadquartersbeforethedeadline.
A: essential
B: innovative
C: involuntary
D: eternal
A: essential
B: innovative
C: involuntary
D: eternal
举一反三
- Itis（）formarinerstocombinetheSARTwithafloat-freesatelliteEPIRB. A: essential B: compulsory C: optional D: inadvisable
- Inorderto(attain)ourobjective,itis(essential)thatwe(willmake)thebestuseofthelimitedresources(available). A: attain B: essential C: willmake D: available
- 翻译成中文：A business letter should include all thenecessary information. It is essential to check the message carefully before itis sent out.
- –Isthis_______pen? A: your;itis B: you;itis C: his;it’s D: her;isn’t
- "When in eternal lines to time thou grow'st." What do the "eternal lines" refer to?_____