When he will arrive for the meeting ______ unknown, but making a big decision without delay ______a key event now.

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问题 When he will arrive for the meeting ______ unknown, but making a big decision without delay ______a key event now.

选项 A、was; is
B、were; are
C、is; has been
D、are; have been

答案C

解析 “When he will arrive for the meeting”是主语,看作单数;making a big decision是动名词作主语,也看作单数,再根据时态,只能选C。
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