摘要：32．He met many problems he was going over his lessons． A．before B．while C．since D．as soon as
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He met many problems _______ he was going over his lessons．
A．before B．as soon as C．since D．while
查看习题详情和答案>>He met many problems he was going over his lessons．
A．before B．while C．since D．as soon as
查看习题详情和答案>>He met many problems ______ he was going over his lessons．
A．before B．as soon as C．since D．while
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