--- _______did it _______ the conductor to check the tickets this morning? --- Half an hour.
#41200
A
How soon; take
B
How long; cost
C
How often; spent
D
How long; take
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_____ have you been swimming? For five years.
#41171
A
How many times
B
How long
C
How often
D
How much
There are so many kinds of Mp4 in the shop. We can’t decide            . 
#40762
A
to buy what
B
what to buy
C
to buy which
D
which to buy