单项选择题

John's success in his career will be a great ______ to his aged parents.

A) satisfaction
B) attraction
C) solution
D) concentration
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单项选择题
The teacher often warns the students that they can't be ______ careful in doing experiment.
A) much
B) most
C) so
D) too
单项选择题
He's studying hard in case that he ______.
A) would lag behind
B) lags behind
C) should lag behind
D) could lag behind
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