单项选择题

Only if you work hard every day ______ pass the exam.

A．you can
B．may you
C．you must
D．must you
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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
单项选择题
Our teacher never ______ us leave class early.
A．lets
B．allows
C．make
D．tells
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