单项选择题

You ______ yesterday if you were really serious about the job.

A．ought to come
B．ought have come
C．ought come
D．ought to have come
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单项选择题
It is requested that all the students ______ present at the meeting tomorrow.
A．were
B．are
C．will be
D．be
单项选择题
______ I cannot keep up with my classmates.
A．How I try hard
B．Whatever hard I try
C．No matter how I try hard
D．No matter how hard I try
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