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【单选题】
大多数合金元素均在不同程度上有细化晶粒的作用,其中细化晶粒作用最为显著的有 。A.
Mn,P
B.
Mn,Ti
C.
Ti,V
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举一反三
【单选题】The manager says he really can’t ______to wait another day, because he is so busy.
A.
afford
B.
waste
C.
spend
D.
cost
【单选题】He is so busy that he can’t ________ the services of a secretary.
A.
do without
B.
set down
C.
make for
D.
touch on
【单选题】The manager says he really can't _____ to wait another day, because he is so busy．
A.
waste
B.
afford
C.
spend
D.
cost
【单选题】He was so busy that he couldn't help _______ the housework. [ ]
A.
doing
B.
did
C.
do
D.
done
【单选题】Joe is so busy that he can’t ________ the time for a film now.
A.
spare
B.
spend
C.
share
D.
take
【单选题】He was so busy that he couldn’t help ____________ the experiment.
A.
doing
B.
do
C.
did
D.
done
【单选题】As he ______ to his work that he didn't notice that it was already past midnight. [ ]
A.
was so busy
B.
so devoted
C.
was so devoted
D.
was so turned
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