TheWorldHealthOrganizationwarnedthatAsiancountries_______attentivetobirdflusinceAsia_____gotridofthediseasecompletely. [ ]A.shouldkeep;has B.mustremain;hasn-高中英语-n多题

◎ 题干

The World Health Organization warned that Asian countries _______ attentive to bird flu since
Asia _____ got rid of the disease completely.

[ ]

A. should keep; has
B. must remain; has not
C. ought to stay; has been
D. shall be; has not been

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