has been stated before, metals have many good properties.
A. It
B. Which
C. That
D. As
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that there was no time to lose.
A. It occurred to me
B. It was occurred to me
C. As was occurred to me
D. What was occurred to me was
with great difficulty that he persuaded his superior into accepting his plan.
A. It was
B. There was
C. As
D. What
He has been to Italy, but that he understands the Italians.
A. it follows
B. it doesn't follow
C. it is followed
D. it isn't followed
下列试剂,在光照下与不对称烯烃反应,能得到反马氏产物的试剂是()。
A. HF
B. HI
C. HBr
D. HCl
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