钢制固定式压力容器的液压试验压力为设计压力的()倍。
A.1.0
B.1.15
C.1.25
D.1.50
参考答案:C
No one can tell how many sufferings the kidnapped boy ________ when he was rescued yesterday.
A.had
B.has had
C.had had
D.would have
Look! My father_______ with my teacher. [ ]
A. talking
B. are talking
C. talks
D. is talking