问题

It is important for us _____ our English.
A:improving
B:improved
C:to improve
D:improves;
B:improved
C:to improve
D:improves;
正确答案是:
同类题型
He’d rather ________vegetables than _______meat for lunch.
____ frightened us ______ a tiger turned up suddenly in front of us.[ ]
You can find a bargain in the sales; all the goods will be sold________.[ ]
He hardly spent any time on his subjects, _________—_________, so he did badly in his lessons.