To our delight, up till now, the European Union, Japan, and Russia ________ their targets for CO2 emissions (排放).
#103852
A
give
B
have given
C
give
D
gave
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After months of voyage, Columbus arrived in what later to be a new continent.
#101234
A
had been proved
B
was proved
C
had proved
D
proved
—Bob! How’s your project? I heard you started it last Friday, right?—Oh! I ______ for it. But I haven’t decided when to do it.
#100718
A
had prepared
B
was preparing
C
have been preparing
D
have prepared
—— Can’t you notice the person shaking hands with the leader? He is our classmate Tom! —— Oh, my God ! I ____________ him.
#101035
A
don’t recognize
B
didn’t know
C
don’t know
D
didn’t recognize