Both his brother and his sister ______ busy with their homework.

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问题 Both his brother and his sister ______ busy with their homework.

选项 A、is
B、are
C、am
D、be

答案B

解析 此题涉及主语与谓语一致关系。由"both…and…"连接主语时,主语为复数,因此答案为[B]。
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