Tom was ______ that he couldn’t understand ______ difficult sentence.
#93430
A
so a stupid boy; such
B
a so stupid boy; a such
C
so stupid a boy; a such
D
so stupid a boy; such a
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It is the second time that I ____ in Shanghai. What great changes! It’s years since I ____ here last time.
#92644
A
went; had left
B
had been; left
C
have; had left
D
have been; left
This problem is said _____ three times. 
#92660
A
having discussed
B
to have been discussed
C
having been discussed
D
to have discussed
Welcome to visit our company whenever ________.
#92279
A
you are convenient
B
you will be convenient
C
it is convenient to you
D
it will be convenient to you