The students        busily when Miss Brown went to get the book she      in the office.
#101482
A
were writing; left
B
wrote; had left
C
had written; left
D
were writing; had left
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They _____ on the program for almost one week before I joined them, and now we _____ it as no good results have come out.
#101978
A
had been working; are still working
B
had worked; were still working
C
have been working; have worked
D
have worked; are still working
I       Beijing in a few days. Do you know when the earliest plant      ?
#101376
A
leaves for; takes off
B
am leaving for;is taking off
C
am leaving for; takes off
D
leave for; taking off
Mr. Brown ______ his office an hour ago and he is still on his way home.
#100172
A
left
B
leaves
C
is leaving
D
was leaving