--Growing population resulted in growing rubbish. --There is possibility that rubbish ________the major threat to human beings.
#100097
A
becomes
B
is becoming
C
became
D
would become
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The first edition ________ in 1955 and ________ a best seller ever since.
#102314
A
was published;had been
B
was published;has been
C
has been published;has been;
D
had been published;had
By the end of last year another new gymnasium_____ in Beijing
#102241
A
would be completed
B
was being completed
C
has been completed
D
had been completed
By the time I got home yesterday, my husband _______ cooking the dinner.
#102231
A
had finished
B
finished
C
has finished
D
finishes