题目列表(包括答案和解析)
He met many problems _______ he was going over his lessons．
A．before B．as soon as C．since D．while
He met many problems he was going over his lessons．
A．before B．while C．since D．as soon as
He met many problems ______ he was going over his lessons．
A．before B．as soon as C．since D．while
He met many problems ________ he was going over his lessons．
A．before
B．as soon as
C．since
D．while
He met many problems ________ he was going over his lessons．
before
as soon as
since
while
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