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
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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
单项选择题
Sam did nothing else than ______ when he saw the old lady fell down on the ground.
A．stand by
B．standing by
C．stood by
D．stood up
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