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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The medicine had no ______ on him.
A．affection
B．effect
C．affect
D．effective
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It was clever ______ at the answer in two minutes.
A．of him to arrive
B．for him to arrive
C．for his arriving
D．of his arriving
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