In the library, I found a useful book ______ how to use English grammar.    
#93528
A
to explain
B
explained
C
having explained
D
explaining
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         to work overtime that evening, I missed a wonderful film.
#94855
A
Having been asked
B
To ask
C
Having asked
D
To be asked
He told us ________ again.
#94036
A
to never do that
B
never to do that
C
never do that
D
never did that
.- Can I smoke here? - Sorry. We don’t allow _____ here.
#97170
A
people smoking
B
people smoke
C
to smoke
D
smoking