We _____ a light breakfast this morning. [ ]
A. have
B. will have
C. are having
D. had
答案:D
As a rule, this hotel offers___18 percent discount for____guests staying on Friday and Saturday.
A.a; the
B.the; the
C.the;不填
D.an;不填
钻井液密度下降,钻速突然增加,则下列可能钻至()。
A、油、气、水层
B、碳酸盐层
C、高密度岩石层
D、无法判断