单项选择题

If you know what the trouble is, why don't you help them to ______ the situation

A. simplify
B. modify
C. verify
D. rectify
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单项选择题
While being questioned on the court, the man denied ______ the old lady's necklace.
A. having taken
B. taking
C. to have taken
D. to take
单项选择题
If he hadn't stood under the ladder to catch you when you fell, you ______ here now.
A. wouldn't be smiling
B. won't smile
C. couldn't have smiled
D. didn't smile
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