The reason we're so late is______.
A. because of the car breaking down
B. due the care broke down
C. that the car broke down
D. because the car broke down
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The reason she failed in the exam was______.
A. that she hadn't worked hard
B. because she hadn't worked hard
C. why she hadn't worked hard
D. because she was too careless
A hinge joint is______ permits the forward and backward movement of a door.
A. what
B. that
C. which
D. where
起跑时重心在哪？
A. 重心在身体靠前
B. 重心在身体靠后
C. 重心在身体中间
起跑的蹬地方向在哪？
A. 向前推
B. 向后推
C. 侧前方
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