保留，记住____________
A: sustain
B: retain
A: sustain
B: retain
举一反三
- More poles are needed to ______ the weight of the tent. A: retain B: B. sustain C: C. maintain D: obtain
- According to the report, some well-known scientists believe that there is not enough oxygen on Mars to __________ human life.() A: sustain B: retain C: remain D: entertain
- He built a pair of wings of a size suitable to _______ his own weight, and made use of gravity as his motor. A: entertain B: retain C: obtain D: sustain
- We’d like to ____a table for five for dinner this evening.[br][/br] A) preserve[br][/br] B) retain[br][/br] C) reserve[br][/br] D) sustain
- sustain