单选题：It never occurred to humans until the mid-1990s _____ some a..

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It never occurred to humans until the mid-1990s _____ some animals can be cloned.
A. where
B. that
C. when
D. what

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_____ you understand the rule, you'll find English easy to ..

_____ you understand the rule, you'll find English easy to learn.A. AsB. While C. OnceD. Whether

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短文改错。 Some things about computers are easier as you may..

短文改错。 Some things about computers are easier as you may fear. First, computers are logical. Things at first seems difficult will make sense to you after you learn the rules. Second, it is really not hardly to learn enough to use today machines. You don�

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It was a nice meal, _____ a little expensive. [ ]A. though..

It was a nice meal, _____ a little expensive.A. thoughB. whetherC. as D. since

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—Are you coming for dinner?—I’m not quite sure. I ______..

—Are you coming for dinner?　—I’m not quite sure. I ______ go to my uncle’s instead.A．must B．wouldC．shouldD．might

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_____ I could say a word, she had stormed out of the room. ..

_____ I could say a word, she had stormed out of the room.A. BeforeB. When C. After D. Until

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