He had tried to put the unpleasant scene out of his mind, but it kept on _______ to him, especially in dreams.
A. contributing
B. owing
C. leading
D. recurring
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An unexpected guest _______ on us last night.
A. decreased
B. declined
C. descended
D. dropped
The trend of brain drain does the developing countries _______ degrees of harm.
A. diverse
B. drive
C. diver
D. diversity
Some experts say the _______ weather recently experienced by China was caused by EI Nino.
A. flexible
B. abnormal
C. selective
D. decent
51单片机内部定时/计数器是()计数器。
A. 14位加法
B. 16位加法
C. 16位减法
D. 14位减法