David can speak idiomatic American English and yet, _____ English, he doesn't know it at all. 
#73915
A
how to teach
B
when it comes to teaching
C
when he teaches
D
however he teaches
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Not until midnight______back from work, drunken .
#73737
A
he did come
B
he came
C
didn't he come
D
did he come
The hospital opposite our school operates well, _____many patients _____ every day.
#69544
A
where; are being treated
B
which; are treated
C
where; are to be treated
D
that; have been treated
Could you drive me to the supermarket after supper if _________________?
#67702
A
it is convenient of you
B
you are convenient
C
it is convenient to you 
D
you will be convenient