单项选择题

Both his brother and his sister ______ busy with their homework.

A．is
B．are
C．am
D．be
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单项选择题
Tony ______ yesterday if he were really serious about his work.
A．ought to come
B．should come
C．must have come
D．should have come
单项选择题
______ difficulties we may have, we must finish the task as required.
A．Whatever
B．Whichever
C．Of which
D．No matter how
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