My wallet is nowhere to be found. I ____ when I was on the bus. （QE96-36）
A.must have dropped it B.must drop it C.should have dropped it D.ought to have dropped it正确答案A
My wallet is nowhere to be found. I ____ when I was on the bus. （QE96-36）
A.must have dropped it B.must drop it C.should have dropped it D.ought to have dropped it正确答案A
