英语难题____ China has become a member of WTO,English is more po

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英语难题
____ China has become a member of WTO,English is more popular than berore.
A.Since B.Though C.Whether D.If
请给出词的具体用法及区别,

选A.
因为中国已经成为了WTO的一员,所以英语比以往更流行了.
Since 表示原因（说话人、听话人都已经知道的原因）.在这个句子中不表示 “自从”.如果表示自从的话,从句的时态需要改成一般过去时.
Though 虽然 …… 但是.放在句中意思不通顺
Whether 是否.放在句子中不通顺
If 如果.放在句子中也不通顺.另外主句是一般现在时态,从句是现在完成时.所述内容都已经是既成事实.无法用 if .

英语难题____ China has become a member of WTO,English is more po Since China has been a member of WTO, English is ____ useful Since China has been a member of WTO,English is ____useful t China has become a member of the world community 求求求求 China _____ the WTO and become a member of it in 2001. as china joined WTO ,english become a more useful and import what time is it?i want to become a member of the english clu it has become a member of ous family China is a country with a (po ) of more than 1.3 billion. China becaum a member of the ______in 2011.A WTO B UK C UN D China __________ the WTO and became a new member of it. A．jo What opportunities will China obtain as a member of the WTO.