________ hard you try,it is difficult to lose weight without cutting down the amount you eat.(2012·湖南)
#30448
A
However
B
Whatever
C
Whichever
D
Whenever
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     , you should keep it a secret; or you will ruin our plan.
#30593
A
If asking
B
If asked
C
If to ask
D
If being asking
_________ he took plane, he was frightened to cry.
#31031
A
First time
B
At the first time
C
For the first
D
The first time