In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
#101293
A
has tried
B
has been tried
C
have taken
D
have been taken
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The book has been translated into thirty laguages since it ____ on the market in 1973.
#101181
A
has come
B
comes
C
had come
D
came
China ______ a lot of people moving to urban areas in the last 20 years. However, many migrants left their families behind.
#100122
A
saw
B
sees
C
has seen
D
had seen
--- Daniel，why are you so late? We _______ you would be here an hour ago. --- Sorry. I ________ know you were all here.
#102326
A
expect, don’t
B
expected; don’t
C
expected, didn’t
D
expect; didn’t
Everything he _____ to his country.
#103067
A
had was contributed
B
had been contributed
C
had to be contributed
D
had contributed
I must be off now. My friends ________ outside.
#101616
A
wait
B
have waited
C
are waiting
D
were waiting