【題目】She's worried ______ her test.
A.because
B.because of
C.so
D.that

【答案】B
【解析】句意：因為她的考試她感到擔心。because因為，連詞，后加從句；because of因為，介詞短語，后加名詞或者名詞短語。結(jié)合句意及結(jié)構(gòu)，所以答案是B。

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