By the time he ____ at the party, all the other guests ____ playing games.
A．a(chǎn)rrived; had begunB．a(chǎn)rrived; began
C．had arrived; beganD．had arrived; have begun
A
考查by的時態(tài)。By的用法是，by后面跟什么時態(tài)，主句就采用什么完成時，總之by是完成時的標(biāo)志。 所以選擇A
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