1.________ more careful, his ship would not have sunk
A.Had the captain been
B.If the caption were
C.Should the captain be
D.If the caption would have been
2.Child ________ he is, he knows a lot
A.even though
B.though
C.as
D.although
3.The children ran away from the vineyard ________ they saw the guard
A.at the moment
B.the moment
C.before
D.as long as
4.________ there is no rain, farming is difficult or impossible
A.For
B.Where
C.While
D.As
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