1.There is no doubt ________ Catherine is fond of dancing, for she always
practices it on weekends.
A. whether B. if C. that D. which
【答案】C。解析：考查同位語從句，句意：毫無疑問Catherine喜歡跳舞，因為她總是在周末練舞。分析句子的結(jié)構(gòu)可知，逗號之后為“for”引導(dǎo)的原因狀語從句，逗號之前是主句，主句中結(jié)構(gòu)為"There
is no doubt
that…"意為"毫無疑問…"，連詞"that"引導(dǎo)同位語從句解釋說明名詞"doubt"的具體內(nèi)容，同位語從句中句子結(jié)構(gòu)和意思已完整，"that"無意義也不充當(dāng)成分，只起連接詞的作用.故C為正確答案。
2.You have seen the girl ________ sister is a Chinese teacher.
A. whom B. of whom C. whose D. of which
【答案】C。解析：此句先行詞為the girl，定語從句為sister is a Chinese teacher，二者構(gòu)成的完整句為The girl’s sister is a Chinese teacher.先行詞的’s所有格構(gòu)成的所屬關(guān)系結(jié)構(gòu)在從句中作定語。故選C。
3.He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A. and B. for C. but D. or
【答案】B。解析：此題考查原因狀語從句?！癶is eyesight was beginning to fail”是“he found it increasingly difficult to read”的原因，因此本題應(yīng)選用可以表示原因的連詞for引導(dǎo)原因狀語從句。故選B。
4.Mr. Smith used to smoke______, but he has given it up.
A. seriously B. heavily C. badly D. hardly
【答案】B。解析：seriously認(rèn)真地;badly嚴(yán)重地;hardly幾乎不。smoke heavily煙吸得很厲害。為固定說法。故選B。
5.The crazy fans ________ patiently for two hours and they would wait till the movie star arrived。
A.were waiting B.had been waiting C.had waited D.would wait
【答案】B。解析：因為would wait是過去將來時，可見此事發(fā)生在過去，再結(jié)合for two hours可知，wait這個動作是從過去某一時刻開始一直延續(xù)到另一個過去時刻，并且還在等，一直要等到那位影星到來，所以用過去完成進行時：had been doing，因此選B。
6.This machine is very easy ________. Anybody can learn to use it in a few minutes.
A. operating B. to be operating C. operated D. to operate
【答案】D。解析：在句型“主語+be+adj+to do”中，如果這個主語是動詞do的邏輯賓語，故用主動表被動，所以選D。