He ran ______ quickly ______ I couldn’t catch up with him.
A. such, that
B. so, that
C. hardly, when
D. no sooner, than
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Do what you have been told, ____ you will be punished.
A. and
B. but
C. or
D. after all
Take an umbrella ______ it rains.
A. in case
B. in any case
C. because
D. for
血液凝固发生的原因是
A. 红细胞叠连
B. 血细胞凝聚
C. 纤维蛋白形成
D. 红细胞破裂
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