题目内容
Being physically examined for free twice a year is what every clerk ________ be ensured in any company of the state.
[ ]
A.must
B.shall
C.ought to
D.need
答案:B

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题目内容
Being physically examined for free twice a year is what every clerk ________ be ensured in any company of the state.
A.must
B.shall
C.ought to
D.need