When the students heard the alarm, they all hurried to        they thought was an emergency exit door．
A．whatB．whichC．whereD．who
A

試題分析：此處to是介詞，其后是介詞的賓語從句，what在賓語從句作主語。句意：當(dāng)學(xué)生們聽到警報聲，他們都急忙沖向他們認(rèn)為的應(yīng)急出口。
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