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【单选题】
下列药物中,能采用重氮化一偶合反应进行鉴别的是A.
阿司匹林
B.
美洛昔康
C.
尼美舒利
D.
对乙酰氨基酚
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反馈参考答案：
举一反三
【单选题】----You didn’t wait for Mr. Smith last night, did you? ---- Yes, but we _______. He didn’t return home at all.
A.
needn’t have
B.
should have
C.
didn’t need to
D.
don’t have to
【单选题】—You didn't wait for Mr. Smith last night, did you? —Yes, but we ________. He didn't return home at all.
A.
don't have to
B.
needn't have
C.
didn't need to
D.
should have
【单选题】—You didn’t wait for Mr. Black last night, did you? —No, but we ____. He didn’t return home at all.
A.
couldn’t have
B.
needn’t have
C.
didn’t need to
D.
should wait have
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