可以問個問題嗎? - 自學

板上的各位大師，小弟不才，有幾個問題想請教：

1、I _______ the car at 8:00 tomorrow morning.
(a) will be washing (b) will have washed (c) washed (d) was washing
答案：(a)
疑問：為什麼是will be washing 而不是 will wash?

2、"Did Julie come here and visit?"
"She _______ here twice since March 1989."
(a) has visited (b) visited (c) visits (d) had visited
答案：(a)
疑問：為什麼不是(b)呢?

還請各位解疑惑，謝謝。

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http://www.wretch.cc/blog/Junron
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