Charles Babbage is generally considered ________ the first computer. 
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A
to invent
B
inventing
C
to have invented
D
having invented
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The plan to be carried out next month needs _______ among the members of the labor union before _________ . 
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A
to discuss, carrying out
B
to be carried out, carried out
C
discussing, being carried out
D
discussed, to be carried out
.His conclusion, ______ on careful research, was acceptable.
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A
to base
B
to be based
C
basing
D
based
Before he came , I’d finished _______ the whole book. 
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A
to read
B
to have read
C
reading
D
read