There was so much noise that the speaker couldn ’t make himself ________.
A. hear
B. heard
C. hearing
D. to hear
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铁粒幼细胞性贫血与缺铁性贫血鉴别主要选择下列哪项检测()
A. 红细胞内游离原卟琳测定
B. MCV.MCH. MCHC
C. 血清铁饱和度
D. 血清铁饱和度
E. 血清总铁结合力
室间质控中,求均值的样本数不能少于()
A. 20 ↑
B. 50 ↑
C. 100 ↑
D. 150 ↑
E. 没有明确的规定
The money would have to be raised by ________ taxation.
A. far
B. farther
C. farthest
D. furthe
He became a successful actor ________ his father never was.
A. who
B. whom
C. that
D. when