A.didn’t invent | B.wouldn’t invent |
C.hadn’t invented | D.wouldn’t have invented |
A.must | B.might | C.should | D.would |
A.must | B.can | C.should | D.would |
A.would ; on | B.might; from | C.could; with | D.should; at |
A.shall | B.Will | C.Would | D.Do |
A.might | B.can | C.must | D.should |
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