1.Helen is always thinking of others first,____ ,of course,makes her very popular.A.which B.who C.what D.this2._____ you know how to learn English ,you 'll find it easy to master it.填Once 还是Only?

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1.Helen is always thinking of others first,____ ,of course,makes her very popular.A.which B.who C.what D.this2._____ you know how to learn English ,you 'll find it easy to master it.填Once 还是Only?
1.Helen is always thinking of others first,____ ,of course,makes her very popular.
A.which B.who C.what D.this
2._____ you know how to learn English ,you 'll find it easy to master it.
填Once 还是Only?

1.Helen is always thinking of others first,____ ,of course,makes her very popular.A.which B.who C.what D.this2._____ you know how to learn English ,you 'll find it easy to master it.填Once 还是Only?
1.A
把"of course,"去掉,就是个非限制性定语从句
2.Once
若用Only的话后面的句子要倒装

A
once

1 C
2 Once

A 只有WHICH才能引导非限定性定语从句.
Once 一旦