【题目】—Can you make sure ?
—Sorry, I can't.
A.when will she arrive
B.whether she will join us or not
C.why she would speak in the meeting

【答案】B
【解析】考查宾语从句。句意：——你能确定她是否会加入我们？——抱歉，我不能。这里含有一个宾语从句，根据语境推断，所以答案是B。