问题
选择题
You'll fail your next exam _______ you start to work hard at your lessons now．[ ]
A．because
B．if
C．so
D．unless
答案
答案：D
搜题请搜索小程序“爱下问搜题”
You'll fail your next exam _______ you start to work hard at your lessons now．[ ]
A．because
B．if
C．so
D．unless
答案：D
