[文法]However vs Whether

※ _____difficult the task may be, you have to try every means to complete it.
(a)Whatever (b)However (c)Whether (d)No matter
解答是(B) 請問為什麼不能選Whether?
※I wonder how much_____________ to make a phone call to Tokyo.
(a)it costs (b)does it cost (c)cost you (d)will it cost
解答是(A) 請問(B)為什麼錯?
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