兩題英語選擇題以及一些英語的語法問題.
1.I can think of many cases___students obviously knew a lot of English words and expressions but couldn't write a good essay.
A.why B.which C.as D.where
2.You can only be sure of____you have at present;you cannot be sure of something____you might get in the future.
A.that;what B.what;不填 C.which;that D.不填；that
什么時(shí)候該用both of+關(guān)系代詞 ,什么時(shí)候該用both of+代詞?
例如,last week,only two people came to look at the car,____wanted to buy it.
橫線上應(yīng)該填寫both of whom 還是both of them?