some students are lack of the first class _______ they take their vacations.[

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some students are lack of the first class _______ they take their vacations.[     ]
A. because of
B. as
C. before
D. and

答案

举一反三

          they are twins, they don"t look like the same at all.    [     ]
A. Because
B. Though
C. As
D. Since

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-Shall we go on working?
-Yes, _____ I prefer to have a rest.[ ]
A. when
B. if
C. though
D. because

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If you want to be a factory manager, you must learn            to make machines.    [     ]
A. what
B. when
C. where
D. how

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I like sofa            it"s much softer than a chair.    [     ]
A. if
B. after
C. because
D. that

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         you are in Hangzhou, please buy me some green tea.      [    ]
A. Because
B. While
C. As
D. Though

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