Upon ______ the office, he saw the message on his desk. 
#96372
A
he arrived
B
arrived at
C
arriving at
D
arriving
推荐题目
Most of the professors _____ to our school were from South Africa.
#97944
A
invited
B
to be invited
C
being invited
D
had been invited
We are invited to a party _______ in our club next Friday.
#92342
A
to be held
B
being held
C
held
D
holding