问题
选择题
I have no idea ＿＿＿ David is in trouble, he will turn to you for help.
A．if
B．that
C．when
D．that if
答案
答案：D
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I have no idea ＿＿＿ David is in trouble, he will turn to you for help.
A．if
B．that
C．when
D．that if
答案：D