问题
________ of my sisters are experts in agriculture. Helping the farmers improve their farming techniques _________their duty.
A:Each; are
B:Both; is
C:Neither; are
D:None; is
B:Both; is
C:Neither; are
D:None; is
正确答案是：
同类题型
Our school covers the Outstanding Student Award ___________ after each exam.
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The park is a good placeon Sundays.
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Can you catch what I said?—Sorry, I can _________ understand it.