麻烦给出正确答案,再加以解释,

麻烦给出正确答案,再加以解释,
（ ）1.We’ll go swimming if the weather______fine tomorrow.
A.is B.was C.will be D.is going to be
（ ）2.You must study hard if you______ want to fail the exam.
A.won’t B.don’t C.haven’t D.hadn’t
（ ）3.—I’m afraid you can’t sit here .—Sorry ,I______know.
A.don’t B.won’t C.can’t D.didn’t
（ ）4.—Jim is not coming tonight .—But he______
A.promises（许诺） B.promised C.will promise D.had promised
（ ）5.He often______his clothes on Sundays.
A.washing B.washes C.has washed D.wash
（ ）6.I’m Chinese.Where______from?
A.do you come B.you are coming C.you come D.are you coming
（ ）7.How long ago______playing football?
A.have you stopped B.had you stopped C.did you stop D.do you stop
（ ）8.Don’t talk so loudly .Your father______.
A.sleeps B.is sleeping C.slept D.had slept
（ ）9.How many people does the doctor know who______of the disease (疾病)?
（ ）10.Maths,one of the most important subjects,______always interested him.
A.has B.have C.are D.is
（ ）11.—Did your brother go to America last year?—______.
A.No ,he did never go there B.No ,he has never gone here
C.No ,he never was there D.No ,he’s never been there
（ ）12.Last week John______his leg.
A.felt and broken B.fell and broke C.feels and breaks D.fallen and broken
（ ）13.Jack______his thick coat because it was snowing.
A.puts on B.put on C.takes on D.took on
（ ）14.He______the picture on the wall.
A.hanged B.hung C.has hanged D.was hanged
（ ）15.By the end of last term we______English for two years.
A.have studied B.have been studied C.would studied D.had studied
（ ）16.When we arrived ,the dinner______.
A.already began B.has already begun C.had already begun D.was just begun
（ ）17.I will go home for the holiday as soon as I______ my exams.
A.will finish B.finish C.finishing D.finished

1.C 将来进行式
2.A （同上）
3.A 首先排除B、C,然后根据题意即得出答案A
4.D had过去进行式,承诺只有是先说出,说好的
5.B 复数形式,表多次
6.D 语法是这样
7.B
8.B 现在进行时
9.（没选项啊）
10.B
11.B
12.C 复数形式
13.C
14.D
15.D
16.B
17.D 过去式