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【单选题】
When did radioactive sulfur atoms appear at the west coast of America?
A.
At the moment the earthquake and tsunami happened.
B.
Before the tsunami attacked the east coast of Japan.
C.
After the earthquake and the related disasters happened.
D.
Two weeks after a nuclear power plant in Fukushima collapsed.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】– I rang you at about ten o’clock, but there was no reply. – Oh, that was probably ________ I was seeing the doctor.
A.
when
B.
why
C.
what
D.
that