问题

Everyone should play a part in _____the earth.
A:save
B:saves
C:saving
D:saved
B:saves
C:saving
D:saved
正确答案是:
同类题型
Mum, have you seen my mobile phone?—_______ you bought last week? I’m afraid I haven’t seen _______.
Has your brother ever been to the Sand Lake?––Yes, he has _______ the Sand Lake many times.
Hardly_________the phoneI was told that the hotel had been booked full.