单项选择题

______ more careful, his ship would not have sunk.（）

A. If the captain were
B. Had the captain been
C. Should the captain be
D. If the captain would have been

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Happily for john's mother, he is working harder to ______ his lost time.（）

A. make up for
B. keep up with
C. catch up with
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单项选择题
Shanghai is in ______ east of China.（）

A. /
B. an
C. a
D. the
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