The flowers _______often.
A．must be water B．must be watered
C．must watered D．must water
B
此處考查情態(tài)動詞后的被動式，情態(tài)動詞后的被動式結(jié)構(gòu)為must+be done, 因此可以排除A.C.D, 故選B.本句意思是：花必須經(jīng)常澆。
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