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【单选题】
某化合物R，其燃烧的化学方程式：R+3O 2 点燃 . 2CO 2 +3H 2 O则R可能是下列物质中的（ ）A.
C 2 H 6
B.
C 2 H 6 O
C.
C 2 H 4
D.
C 2 H 4 O 2
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【单选题】They happened to ______for Tianjin when we got there.
A.
leave
B.
have left
C.
leaving
D.
had left
【单选题】They us willingly but they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【单选题】They _____ us willingly but that they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【简答题】A wise man was walking from one town to another with a few of his followers, and they happened to pass a lake. So they stopped there to 1 for a while, and the wise man said to one of his followers, “I...
【单选题】They______ us willingly but that they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【单选题】They happened to__________ for Tianjin when we got there.A.leaveB.have left###SX
A.
They happened to__________ for Tianjin when we got there. A.leave
B.
have left
C.
leaving
D.
had left
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