单项选择题

If you (try to) learn (too) many things (at a time) you may get (confusing).

A．try to
B．too
C．at a time
D．confusing
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The waste, (according) to the people there, has (already) found (their) way into (the) drinking water.
A．according
B．already
C．their
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Only when (it started) to rain (he noticed) that he (had left) his raincoat (somewhere).
A．it started
B．he noticed
C．had left
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