题干
——Why are you late for the meeting?
—— I got caught in the heavy rain, or I _______ earlier.
—— I got caught in the heavy rain, or I _______ earlier.
A：arrived
B：had arrived
C：would arrive
D：would have arrived
答案(点此获取答案解析）
D
)，会对人体产生一定
危害。该原子中中子数和质子数之差是