only when you have acquired a good knowledge of grammar ____ fluently.
A. you will write
B. can you write
C. you can write
D. you could write
查看答案
only when david did it a second time ____.
A. he realized his mistake
B. he was realizing his mistake
C. did he realize his mistake
D. he did realize his mistake
surroundings have changed and ____ in them.
A. so have the people
B. the people have so
C. have the people so
D. the people so have
___ dark was the night that we had to rely on our ears instead of our eyes.
A. how
B. extremely
C. very
D. so
____ that the pilot couldn’t fly through it.
A. the storm so severe was
B. so severe was the storm
C. so the storm was severe
D. such was the storm severe
微信支付 
支付宝支付