We had hardly arrived at the foot of the Yuntai Mountain         it began to rain heavily .
#30964
A
than
B
when
C
until
D
after
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________we went to visit Professor Smith, he________his research work.
#31550
A
The first time; devoted to
B
Whenever; was concentrate on
C
For the first time; was busy with
D
Each time; was absorbed in