By my 50th birthday, I________in my current profession for o

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动词的过去分词

[单选题]By my 50th birthday, I________in my current profession for over 20 years．

A. would have been
B. would be
C. will be
D. will have been

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[单选题]Dreams are often an elegant means of highlighting problems________ in the present or the past．

A. faces
B. facing
C. faced
D. that face

[多选题]下列能排酸保碱，维持机体酸碱平衡的有（　　）

A. H+的分泌
B. K+的分泌
C. NH3的分泌
D. H+一Na+交换
E. H+一K+交换

[单选题]止于下颌颈的肌是（　　）

A. 翼内肌
B. 咬肌
C. 颞肌
D. 翼外肌
E. 颊肌

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