问题描述：
英语连词的用法?
One can't learn a foreign language well _____ he studies hard.
A.because B.though C.unless D.if
Sara is the girl over there _____ wears a red skirt.
A.whom B.which C.不填 D.who
What would you do,_____,if you had one billion dollars?
A.for instance B.at first C.such as D.so far
One can't learn a foreign language well _____ he studies hard.
A.because B.though C.unless D.if
Sara is the girl over there _____ wears a red skirt.
A.whom B.which C.不填 D.who
What would you do,_____,if you had one billion dollars?
A.for instance B.at first C.such as D.so far
问题解答：
我来补答展开全文阅读