题目内容
（请给出正确答案）
[主观题]
The student asked her professor if he would have gone on the space ship he did know earlie
r.
A．if he knew
B．if he knows
C．he had known
D．had he known
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A．必须按照《化学品企业事故隐患排查治理实施导则》要求排查治理隐患
B．必须按照《化学品企业隐患排查治理实施导则》要求排查治理隐患
C．必须按照《危险化学品企业事故隐患排查治理实施导则》要求排查治理隐患
D．必须按照《危险化学品企业隐患排查治理实施导则》要求排查治理隐患
